1. Department of Automotive Technologies, Budapest University of Technology and Economics, Stoczek street 6., 1111 Budapest, Hungary
2. Institute of Technical Physics and Materials Science, Hungarian Academy of Sciences, Konkoly Thege Miklós út 29-33., 1121 Budapest, Hungary
3. Institute of Engineering, University of Dunaújváros, Táncsics M. street 1/a, 2401 Dunaújváros, Hungary