1. Faculty of Mechanical Engineering, Bialystok University of Technology, 45C, Wiejska Str., 15-351 Bialystok, Poland
2. Ukrainian Academy of Printing, Pidgolosko Str. 19, 79020 L’viv, Ukraine
3. Lutsk National Technical University, Lvivska Str. 75, 43018 Lutsk, Ukraine