Publications
Change search
Link to record
Permanent link

Direct link
BETA
Sandberg, Ulf
Alternative names
Publications (10 of 119) Show all publications
Vieira, T., Sandberg, U. & Erlingsson, S. (2019). Acoustical performance of winter tyres on in-service road surfaces. Applied Acoustics, 153, 30-47
Open this publication in new window or tab >>Acoustical performance of winter tyres on in-service road surfaces
2019 (English)In: Applied Acoustics, ISSN 0003-682X, E-ISSN 1872-910X, Vol. 153, p. 30-47Article in journal (Refereed) Published
Abstract [en]

Exposure to excessively high noise levels is a relevant health problem in Europe and road traffic noise is the most widespread noise source. When considering cold climate countries, the available scientific literature on noise emission properties of winter tyres is still very limited. In order to contribute into filling this knowledge gap, this paper investigates the acoustical performance of different types of tyres, with focus on winter tyres, on different road surfaces, at different speeds, and with different states of wear. The results indicate that studded winter tyres have, indeed, an increased noise level at frequencies between 315 Hz and 10 kHz, having a significantly different response especially at frequencies higher than 4 kHz. The acoustical response also depends on the tyre type when comparing different road surfaces, as a result of conflicting vibrational and aerodynamic noise generation mechanisms. Additionally, the relationship between labelled and measured values was explored, however, no statistically significant relationship was found between them (and labelling is not applied for studded tyres). A frequency spectrum correction was attempted based on previous measurements on an ISO track, which reduced the difference between measured and labelled values, however, further investigation is still required to properly understand differences between label and road measurements, where the label is determined on a test track with a special, smooth surface.

Place, publisher, year, edition, pages
Elsevier Ltd, 2019
Keywords
Studded tyre, Winter, Tyre, Noise, Measurement, Frequency, Spectrum, Acoustics
National Category
Infrastructure Engineering
Research subject
90 Road: Vehicles and vehicle technology; 90 Road: Vehicles and vehicle technology, 93 Road: Vehicles and the environment
Identifiers
urn:nbn:se:vti:diva-13718 (URN)10.1016/j.apacoust.2019.03.025 (DOI)2-s2.0-85064087138 (Scopus ID)
Available from: 2019-05-09 Created: 2019-05-09 Last updated: 2019-05-09Bibliographically approved
Vieira, T., Sandberg, U. & Erlingsson, S. (2019). Negative texture, positive for the environment: effects of horizontal grinding of asphalt pavements. International Journal on Road Materials and Pavement Design
Open this publication in new window or tab >>Negative texture, positive for the environment: effects of horizontal grinding of asphalt pavements
2019 (English)In: International Journal on Road Materials and Pavement Design, ISSN 1468-0629, E-ISSN 2164-7402Article in journal (Refereed) Published
Abstract [en]

A pavement surface having deflections from a plane mostly directed downwards in valleys is said to have a “negative texture”, in contrast to a “positive texture” dominated by peaks. Negative textures are typical of porous asphalt pavements, but another way to achieve this feature is to grind off the peaks of the surface. This paper explores the effects of grinding off texture peaks in the horizontal plane on a number of Swedish asphalt pavements in order to reduce noise and rolling resistance. Noise measurements were made to evaluate the ground-off surfaces versus the original surfaces, and, in most cases, also rolling resistance, texture and friction were also evaluated. It was found that grinding led to a more negative texture, tyre/road noise reductions up to 3 dB and tyre/road rolling resistance reductions up to 15%. It is concluded that horizontal grinding provides a maintenance operation with a significant potential for reduction of noise and rolling resistance, without sacrificing friction, though with limited longevity.

Place, publisher, year, edition, pages
Taylor and Francis Ltd., 2019
National Category
Infrastructure Engineering
Identifiers
urn:nbn:se:vti:diva-13886 (URN)10.1080/14680629.2019.1610476 (DOI)2-s2.0-85065057324 (Scopus ID)
Available from: 2019-06-05 Created: 2019-06-05 Last updated: 2019-06-05Bibliographically approved
Sandberg, U., Mioduszewski, P. & Vieira, T. (2018). Acoustic lifecycle study of the double-layer porous asphalt on E4 in Huskvarna, Sweden. In: INTER-NOISE 2018 - 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering. Paper presented at 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018, 26 August 2018 through 29 August 2018. Institute of Noise Control Engineering
Open this publication in new window or tab >>Acoustic lifecycle study of the double-layer porous asphalt on E4 in Huskvarna, Sweden
2018 (English)In: INTER-NOISE 2018 - 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, Institute of Noise Control Engineering , 2018Conference paper, Published paper (Refereed)
Abstract [en]

In 2010 a double-layer porous asphalt concrete (DPAC) pavement was constructed on the E4 motorway through the Swedish city Huskvarna. Earlier experience in Sweden indicated that it was feasible to obtain a high initial noise reduction but due to the widespread use of studded tires in winter, clogging and ravelling created losses of around 2 dB per year, with an expected acoustical lifetime of only 3 years. However, the improved pavement in Huskvarna finally exceeded lifetime and durability expectations by at least 100 %. The first two years, noise reduction fell from the initial 7-8 dB just marginally, compared to an average-age SMA 16 pavement. Now after its 7th year, the pavement had reached its acoustical end of life, with an average noise reduction loss of 0.5 dB per year. This is considered as a break-through for low noise pavements exposed to the winter climate in Sweden and road traffic with most light vehicles equipped with studded tires. This paper presents results of annual noise measurements using the CPX method over the entire lifetime on the DPAC compared to the reference set of SMA 16 pavements. This includes the effects of grinding, cleaning and rejuvenation trials on certain test sections.

Place, publisher, year, edition, pages
Institute of Noise Control Engineering, 2018
Keywords
Surfacing, Porous asphalt, Noise, Decrease, Motorway, Measurement, Life cycle, Experimental road
National Category
Infrastructure Engineering
Research subject
30 Road: Highway design, 33 Road: Surfacing; 10 Road: Transport, society, policy and planning, 15 Road: Environment
Identifiers
urn:nbn:se:vti:diva-13549 (URN)2-s2.0-85059362566 (Scopus ID)
Conference
47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018, 26 August 2018 through 29 August 2018
Available from: 2019-01-30 Created: 2019-01-30 Last updated: 2019-03-14Bibliographically approved
Bühlmann, E., Egger, S., Mioduszewski, P. & Sandberg, U. (2018). An in-depth look at the tire rubber hardness influence on tire/road noise measurements. In: INTER-NOISE 2018 - 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering. Paper presented at 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018, 26 August 2018 through 29 August 2018. Institute of Noise Control Engineering
Open this publication in new window or tab >>An in-depth look at the tire rubber hardness influence on tire/road noise measurements
2018 (English)In: INTER-NOISE 2018 - 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, Institute of Noise Control Engineering , 2018Conference paper, Published paper (Refereed)
Abstract [en]

When assessing the acoustic quality of a road pavement with the close-proximity (CPX) or the on-board sound intensity (OBSI) method, the rubber hardness of the reference tire substantially affects the measurement. Practical experience shows that measurement tires can get significantly harder within a single measurement season. This is why one would like to normalize measurements to a reference rubber hardness. The recently published technical specification defining the reference tires for CPX measurements (ISO/TS 11819-3), therefore, includes a new correction for tire rubber hardness. Early experiences with this new correction procedure raised questions about its accuracy. This paper takes an in-depth look on the influence of tire rubber hardness on CPX measurements for both reference tires P1 and H1. It analyses existing and new data and summarizes the research from several scientific contributions on this topic. It provides evidence that the effect of rubber hardness is tire specific and that separate correction factors for the P1 and the H1 tires lead to accuracy gains and improved repeatability and reproducibility of the method. The study concludes by proposing a revised tire-specific approach for the tire rubber hardness correction of CPX measurement results.

Place, publisher, year, edition, pages
Institute of Noise Control Engineering, 2018
Keywords
Noise, Pavement, Measurement, Tyre, Rubber, Hardness, Correction, Accuracy, Repeatability, Reproducibility
National Category
Vehicle Engineering
Research subject
90 Road: Vehicles and vehicle technology, 911 Road: Components of the vehicle
Identifiers
urn:nbn:se:vti:diva-13556 (URN)2-s2.0-85059429214 (Scopus ID)
Conference
47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018, 26 August 2018 through 29 August 2018
Available from: 2019-01-30 Created: 2019-01-30 Last updated: 2019-03-15Bibliographically approved
Sandberg, U., Kharrazi, S. & Mioduszewski, P. (2018). Comparison Of Noise Emission Of HCT And Classic Vehicle Combinations For Timber Transportation In Sweden. In: : . Paper presented at 15th International Symposium on Heavy Vehicule Transport Technology: HVTT 15, Oct 2018, ROTTERDAM, Netherlands.
Open this publication in new window or tab >>Comparison Of Noise Emission Of HCT And Classic Vehicle Combinations For Timber Transportation In Sweden
2018 (English)Conference paper, Published paper (Refereed)
Abstract [en]

By means of a special simulation tool, the noise emission of a high-capacity heavy vehicle (11 axles) was compared to that of a classic heavy vehicle (a truck-dolly-semitrailer with 8 axles). The two cases are designated “Extended vehicle” versus “Classic vehicle” in this study, having total lengths of 34 and 25 m, respectively. The Classic vehicle represents the most common articulated heavy vehicle configuration for transport of timber and other goods in Sweden. Tyres were assumed to be typical of each axle and their noise emission values were taken from a recent study. Noise from the propulsion unit were assumed to just meet the present maximum legal levels. It was found that noise emission from the Extended vehicle is approx. 1.5 dB higher than for Classic vehicle, as max. A-weighted level per vehicle passage, but as the number of vehicles in traffic is lower for a certain transportation volume, the resulting road traffic noise exposure in terms of A-weighted equivalent level LAeq is similar. Consequently, noise emission is not a factor that gives either vehicle type a clear advantage over the other.

Keywords
Longer and heavier vehicle, Noise, Timber, Freight transport, Calculation
National Category
Transport Systems and Logistics
Research subject
90 Road: Vehicles and vehicle technology, 93 Road: Vehicles and the environment
Identifiers
urn:nbn:se:vti:diva-13574 (URN)
Conference
15th International Symposium on Heavy Vehicule Transport Technology: HVTT 15, Oct 2018, ROTTERDAM, Netherlands
Available from: 2019-01-31 Created: 2019-01-31 Last updated: 2019-03-15Bibliographically approved
Skov, R. S., Bendtsen, H. & Sandberg, U. (2018). NordTyre: Noise reduction potential in nordic countries by introduction of EU tyre label. In: INTER-NOISE 2018 - 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering. Paper presented at 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018, 26 August 2018 through 29 August 2018. Institute of Noise Control Engineering
Open this publication in new window or tab >>NordTyre: Noise reduction potential in nordic countries by introduction of EU tyre label
2018 (English)In: INTER-NOISE 2018 - 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, Institute of Noise Control Engineering , 2018Conference paper, Published paper (Refereed)
Abstract [en]

The NordTyre project was initiated to investigate the effects of EU tyre label regulation Reg (EC) No1222/2009 on labelling of tyre noise in the Nordic countries. 31 passenger car tyres were tested on 30 Nordic road surfaces in Denmark, Norway and Sweden using the CPX method. A main result is a bad correlation between the measured noise levels and the noise labels of the tyres. The tyre label measurements are made with the Coast-By method (CB), which differs from the CPX method. Further, 30 truck tyres were tested by the CB method on four different pavements. The results of testing both passenger car and truck tyres shows that the noise performance on typical Nordic rougher-textured SMA road surfaces is remarkably different compared to the smoother ISO test surface used for noise type approval. Based on these results, noise scenarios of the effect of using a combination of less noisy tyres and road surfaces have been analysed against the background of national noise mappings in Denmark and Norway. The results of the calculations show that there is a general noise reducing potential and an estimated potential to reduce the Number of Highly Annoyed people from roads by 13 % in Denmark and 19 % in Norway.

Place, publisher, year, edition, pages
Institute of Noise Control Engineering, 2018
Keywords
Tyre, Noise, Specifications, Test, Correlation (math, stat), Sound level, Sweden, Norway, Denmark, Surfacing
National Category
Vehicle Engineering Infrastructure Engineering
Research subject
90 Road: Vehicles and vehicle technology, 93 Road: Vehicles and the environment; 90 Road: Vehicles and vehicle technology, 911 Road: Components of the vehicle
Identifiers
urn:nbn:se:vti:diva-13550 (URN)2-s2.0-85059378280 (Scopus ID)
Conference
47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018, 26 August 2018 through 29 August 2018
Available from: 2019-01-30 Created: 2019-01-30 Last updated: 2019-03-14Bibliographically approved
Vieira, T. & Sandberg, U. (2018). Spectral analysis of the acoustical performance of winter tires for different road textures, test speeds and tire state-of-wear. In: INTER-NOISE 2018 - 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering. Paper presented at 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018, 26 August 2018 through 29 August 2018. Institute of Noise Control Engineering
Open this publication in new window or tab >>Spectral analysis of the acoustical performance of winter tires for different road textures, test speeds and tire state-of-wear
2018 (English)In: INTER-NOISE 2018 - 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, Institute of Noise Control Engineering , 2018Conference paper, Published paper (Refereed)
Abstract [en]

Under winter conditions, in which ice or snow may be present on the road, different tire designs may be used to provide suitable friction levels. One alternative is to have studs embedded in the tire tread to increase friction. Another alternative is to use a studless tire with materials and tread pattern optimized for winter conditions. There is also a hybrid alternative, which is the use of small hard particles instead of regular studs. When considering the acoustical performance, these three different alternatives have different properties; especially, the studded tires behave substantially different. Results from CPX measurements at different speeds and different road sections indicated that the studded tires spectral response is different in two major aspects: (i) a plateau instead of a decreasing trend is found for frequencies higher than 4 kHz, and (ii) overall increased noise levels, resulting in a spectrum that is shifted upwards. This paper analyses how the frequency spectra of winter tires are affected by different road surfaces, test speeds and tire wear. It also attempts to relate the observed behaviour to different contact and noise generation mechanisms to provide a better understanding of the acoustical performance of such tires.

Place, publisher, year, edition, pages
Institute of Noise Control Engineering, 2018
Keywords
Tyre, Winter, Noise, Measurement, Surface texture, Speed, Wear, Spectrum, Acoustics
National Category
Vehicle Engineering
Research subject
90 Road: Vehicles and vehicle technology, 93 Road: Vehicles and the environment; 90 Road: Vehicles and vehicle technology, 911 Road: Components of the vehicle
Identifiers
urn:nbn:se:vti:diva-13544 (URN)2-s2.0-85059369724 (Scopus ID)
Conference
47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018, 26 August 2018 through 29 August 2018
Available from: 2019-01-30 Created: 2019-01-30 Last updated: 2019-03-20Bibliographically approved
Vieira, T. & Sandberg, U. (2017). Acoustical performance of winter tyres on two in-service road surfaces: A frequency spectrum analysis and comparison. In: INTER-NOISE 2017 - 46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet. Paper presented at 46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017, 27 August 2017 through 30 August 2017. Institute of Noise Control Engineering
Open this publication in new window or tab >>Acoustical performance of winter tyres on two in-service road surfaces: A frequency spectrum analysis and comparison
2017 (English)In: INTER-NOISE 2017 - 46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, Institute of Noise Control Engineering , 2017Conference paper, Published paper (Refereed)
Abstract [en]

In order to provide appropriate performance on potentially hazardous winter or icy road surfaces, it is common to employ specific tyres developed for such conditions. Such winter tyres may contain studs embedded in the tyre tread, or they may be studless. Additionally, it is possible to use so called all season tyres which are also fitted for winter conditions. In some northern countries, the usage of winter tyres is mandatory and it is commonly assumed that studded winter tyres are significantly noisier than non-studded tyres. This paper analyses noise measurements on various types of winter tyres, both studded and studless, and the results are compared to all season and summer tyres. The measurements were carried out with the CPX method to characterize the noise performance of different tyres on in-service road surfaces. A total of approximately 50 light vehicle tyres were tested on two different road surfaces, namely an SMA 8 and a DAC 16. The analysis is focused on comparing different frequency spectra for each tyre category, providing a better understanding on how the presence of studs changes the resulting tyre/road noise in different frequencies and how winter tyres compare to all season and summer tyres regarding their frequency spectra. The results indicate how substantially the studs increase the noise level and drastically change the tyre acoustical behaviour at higher frequencies. The frequency spectra for studded tyres presented in this paper have a substantially different shape when compared to the spectra for studless tyres. The most characteristic difference between studded and non-studded tyres appears at frequencies above 4 kHz and is a result of the studs interacting with the road surface.

Place, publisher, year, edition, pages
Institute of Noise Control Engineering, 2017
Keywords
Studded tyre, Winter, Tyre, Noise, Measurement, Frequency, Spectrum, Acoustics
National Category
Infrastructure Engineering
Research subject
90 Road: Vehicles and vehicle technology, 93 Road: Vehicles and the environment
Identifiers
urn:nbn:se:vti:diva-12871 (URN)2-s2.0-85042014268 (Scopus ID)
Conference
46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017, 27 August 2017 through 30 August 2017
Available from: 2018-04-04 Created: 2018-04-04 Last updated: 2018-05-18Bibliographically approved
Sandberg, U. (2017). Calibrating the ISO 10844 test surfaces used for vehicle and tyre noise testing. In: INTER-NOISE 2017 - 46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet. Paper presented at 46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017, 27 August 2017 through 30 August 2017. Institute of Noise Control Engineering
Open this publication in new window or tab >>Calibrating the ISO 10844 test surfaces used for vehicle and tyre noise testing
2017 (English)In: INTER-NOISE 2017 - 46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, Institute of Noise Control Engineering , 2017Conference paper, Published paper (Refereed)
Abstract [en]

When measuring noise emission of road vehicles or tyres, regulations such as ECE R51, R30 and R117 and (indirectly) EU regulations (EC) 661:2009 and 1222:2009, require testing to be made on a reference surface defined in ISO 10844. The surface is claimed to:

• produce consistent levels of tyre/road noise emission under various operating conditions, including those appropriate to vehicle noise testing

• minimize inter-site variation

• provide minor sound absorption

Originally, ISO 10844 was developed with the aim to minimize tyre/road noise, to cause as little influence as possible on vehicle noise during full-throttle acceleration, and it served well for this purpose. However, it was soon applied also to testing in conditions when tyre/road noise is the only or dominating source. Then, it appeared that various sites gave site-to-site variations up to 5-8 dB(A), probably as some users tried to produce as low noise as possible within the tolerances. The 2014 version aimed at reducing the site-to-site variation to half; i.e. about 3-4 dB(A) by applying new or updated measurement methods, allowing tightening of some technical requirements. However, even 3 dB variation is too much, which will seriously limit the efficiency of noise limits and tyre labelling system. This paper proposes a calibration procedure for ISO surfaces, by which one can quantify the differences and correct values to a global reference. This is proposed to be based on the use of the SRTT tyre, defined by ASTM F2493:2014. Several tests have shown this tyre to give reproducible values within approximately 1 dB(A). If a number of such tyres are used; say 8, the variation between different sets will potentially be less than ±0.5 dB(A). Testing ISO 10844 surfaces periodically with such SRTT sets can then be used to determine a site-specific calibration level, to be compared to a global average reference. It is proposed to use the CPX method of ISO 11819-2 and a specific type of CPX trailer, and to observe the requirements in ISO/TS 11819-3 about reference tyres.

Place, publisher, year, edition, pages
Institute of Noise Control Engineering, 2017
Keywords
Tyre, Pavement, Standard specification, Proposal, Noise, Sound level, Calibration
National Category
Infrastructure Engineering
Research subject
90 Road: Vehicles and vehicle technology, 911 Road: Components of the vehicle
Identifiers
urn:nbn:se:vti:diva-12870 (URN)2-s2.0-85042055901 (Scopus ID)
Conference
46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017, 27 August 2017 through 30 August 2017
Available from: 2018-04-04 Created: 2018-04-04 Last updated: 2018-05-21Bibliographically approved
Berge, T. & Sandberg, U. (2017). Five years of EU tyre labelling: Success or failure?. In: INTER-NOISE 2017 - 46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet. Paper presented at 46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017, 27 August 2017 through 30 August 2017. Institute of Noise Control Engineering
Open this publication in new window or tab >>Five years of EU tyre labelling: Success or failure?
2017 (English)In: INTER-NOISE 2017 - 46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, Institute of Noise Control Engineering , 2017Conference paper, Published paper (Refereed)
Abstract [en]

The EU regulation (EC) 1222/2009 concerning tyre labelling has now been effective in Europe since 2012. This regulation specifies limits and mandatory label values for fuel efficiency (rolling resistance), safety (wet grip) and noise (external tyre/road noise level) for new tyres of categories C1, C2 and C3. The label values of these three parameters must be visible on each tyre on a specially designed sticker. The main purpose of this regulation has been to inform the customer about the performance of the tyre regarding the three properties. The paper will discuss the principle behind the tests for each of the properties and the experience so far. A wide range of measurements results, both road and laboratory measurements of noise and rolling resistance, are presented. For the regulation to be effective and fair, the correlation between labelled valued and on-road performance should be reasonably good. Unfortunately, the few studies conducted so far show a poor correlation between labelled values and road measurements. The reason for this lack of correlation may be related to the test track used for measurements and the measurement methods not always being the same. Furthermore, influence of temperature, load and tyre pressure as well as which tyres that are selected for labelling tests may contribute to the poor correlation. It is necessary to identify the problems and their causes and to rectify the problems, since it is believed that in principle the labelling system is an excellent tool to promote high quality tyres that are both safe and environmentally friendly. Possible improvements of the labelling system are discussed in the paper.

Place, publisher, year, edition, pages
Institute of Noise Control Engineering, 2017
Keywords
Tyre, Rolling resistance, Standard specification, Wet road, Noise, Correlation, Laboratory (not an organization), In service behaviour, Measurement
National Category
Vehicle Engineering
Research subject
90 Road: Vehicles and vehicle technology, 911 Road: Components of the vehicle
Identifiers
urn:nbn:se:vti:diva-12869 (URN)2-s2.0-85041998751 (Scopus ID)
Conference
46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017, 27 August 2017 through 30 August 2017
Available from: 2018-04-04 Created: 2018-04-04 Last updated: 2018-05-21Bibliographically approved
Organisations

Search in DiVA

Show all publications