Authors
Heorgij Sulym
Faculty of Mechanical Engineering, Bialystok University of Technology, Bialystok, Poland
Viktor Opanasovych
Faculty of Mechanics and Mathematics, Department of Mechanics, Ivan Franko National University of Lviv, Lviv, Ukraine
Mykola Slobodian
Faculty of Mechanics and Mathematics, Department of Mechanics, Ivan Franko National University of Lviv, Lviv, Ukraine
Yevhen Yarema
Faculty of Mechanics and Mathematics, Department of Mechanics, Ivan Franko National University of Lviv, Lviv, Ukraine