Authors
Nestor Shpak
Lviv Polytechnic National University, Lviv, Ukraine
Nadiya Seliuchenko
Lviv Polytechnic National University, Lviv, Ukraine
Viktoriya Kharchuk
Lviv Polytechnic National University, Lviv, Ukraine
Nataliya Kosar
Lviv Polytechnic National University, Lviv, Ukraine
Włodzimierz Sroka
WSB University, Faculty of Applied Sciences, Dąbrowa Górnicza, Poland
