A. N. Vasilyev - Dr.Sc. (Eng.), Professor, Department Higher Mathematics, Applied Mathematics and Mechanics Institute, St. Petersburg State Polytechnical University. E-mail: a.n.vasilyev@gmail.com
D. A. Tarkhov - Dr.Sc. (Eng.), Professor, Department Higher Mathematics, Applied Mathematics and Mechanics Institute, St. Petersburg State Polytechnical University. E-mail: dtarkhov@gmail.com
A. N. Vasilyev - Dr.Sc. (Eng.), Professor, Department Higher Mathematics, Applied Mathematics and Mechanics Institute, St. Petersburg State Polytechnical University. E-mail: a.n.vasilyev@gmail.com
D. A. Tarkhov - Dr.Sc. (Eng.), Professor, Department Higher Mathematics, Applied Mathematics and Mechanics Institute, St. Petersburg State Polytechnical University. E-mail: dtarkhov@gmail.com