Affiliation: | a Mekhanobr-Tekhnika Corporation, 8a, 21st Liniya, V. O., 199026, St. Petersburg, Russia b Institute for Problems of Mechanical Engineering, Academy of Sciences of Russia, 61, Bolshoy, V. O., 199178, St. Petersburg, Russia c Department of Applied Mathematics, University of Twente, P.O. Box 217, 7500, AE Enschede, The Netherlands |