V. A. Yatskevich – Dr.Sc. (Eng), Professor, Vologda State University

E-mail: vayatskevich@yandex.ru

S. V. Turygin – Engineer, Vologda State University

B.G. Karas − Leading Engineer,

JSC SPE «PROTEK» (Voronezh, Russia)

E-mail: twx@mail.ru

V.A. Shuvaev – Ph.D. (Eng.), Associate Professor, General Director, 

JSC SPE «PROTEK» (Voronezh, Russia)

Е-mail: protek@protek-vrn.ru