O.V. Druzhinina, V.I. Afanasyeva
A. A. Shestakov, О. N. Masina, О. V. Druzhinina
N. V. Andrievskaya - Ph.D. (Eng.), Associate Professor, Perm National Research Polytechnic University. E-mail: nataly-anv@mail.ru
Y. N. Khizhnyakov - Dr.Sci. (Eng.), Professor, Perm National Research Polytechnic University