A.V. Zhuravlev – Dr.Sc. (Eng.), Senior Research Scientist, Main Designer – Deputy General Director, JSC SPE «PROTEK» (Voronezh, Russia)
E-mail: protek@protek-vrn.ru
V.G. Markin – Leading Engineer,
JSC SPE «PROTEK» (Voronezh, Russia)
E-mail: marvigs@mail.ru