V.V. Kiryushkin − Ph.D. (Eng.), Associate Professor, Head of Department, 

JSC SPE «PROTEK» (Voronezh, Russia)

E-mail: kiryushkin.vlad@mail.ru

V.G. Markin – Leading Engineer, 

JSC SPE «PROTEK» (Voronezh, Russia)

E-mail: marvigs@mail.ru

A.V. Shuvaev – Leading Engineer, 

JSC SPE «PROTEK»(Voronezh, Russia)

Е-mail: protek@protek-vrn.ru