Affiliation: | 1. Institute of Problems in Mechanical Engineering, Bolshoy 61, V.O., Saint-Petersburg 199178, Russia;2. St. Petersburg State University, 7-9, Universitetskaya nab., V.O., Saint-Petersburg 199034, Russia;3. St. Petersburg State Polytechnical University, Polytechnicheskaya st., 29, Saint Petersburg 195251, Russia |