1. Faculty of Mechanical Engineering, Bialystok University of Technology, Wiejska Str., 45C, 15-351 Bialystok, Poland
2. Faculty of Engineering, University of Pannonia, Egyetem str., 10, H-8200 Veszprem, Hungary
3. Pidstryhach IAPMM, NANU, Naukova str., 3b, 79060 Lviv, Ukraine