1. Foresight Study of Road Pavement Technologies
2. van Vught F., Brandenburg U., Burquel N., Carr D., Federkeil G., dos Santos Rafael J.A., Sadlak J., Urban J., Wells P., Westerheijden D., Nazarko J., Kuzmicz K., A practical guide. Benchmarking in European Higher Education, ESMU, Brussels (2008)
3. The Directory of Environmental Organizations and Environmental Government Agencies in Europe. United States Environmental Directories, [online] https://earthdirectory.net/europe#Agencies [11.07.2018]
4. A comparison of environmental and energetic performance of European countries: A sustainability index