1. Department of Technical Studies, VSPJ Tolsteho 16, 586 01 Jihlava Czech Republic
2. Institute of Theoretical and Applied Mechanics of the Czech Academy of Sciences, Centre Telc Prosecka 809/76, 190 00 Praha 9 Czech Republic
3. MemBrain s.r.o. Pod Vinici 87, 471 27 Straz pod Ralskem Czech Republic