A.G. Romanova - Engineer, Project department of construction company «Evrodorstroy». E-mail: romalenka@mail.ru
D.A. Tarkhov - Dr.Sc. (Eng.), Professor, Department of Mathematics, St.-Petersburg State Polytechnic University. E-mail: dtarkhov@gmail.com
T.A. Shemyakina - Associate Professor, Department of Mathematics, St.-Petersburg State Polytechnic University. E-mail: st_tat@mail.ru