B.S. Lejepiekov – Engineer, LTD «Special Technological Center» (St. Petesburg)

M.N. Chesnokov – Dr.Sc. (Eng.), Professor, Deputy Head of Department, LTD «Special Technological Center» (St. Petesburg) E-mail: chesnmn@yandex.ru

A.A. Soloviev – Engineer, LTD «Special Technological Center» (St. Petesburg)

E-mail:alanight2@yandex.ru

A.A. Litvinov – Engineer, LTD «Special Technological Center» (St. Petesburg)

E-mail: alalli.spb@gmail.com