Affiliation: | a Institute of Problems in Mechanical Engineering, Bolshoy av. 61, V.O., Saint-Petersburg 199178, Russiab Université Pierre et Marie Curie (Paris 6), Institut Jean le Rond d'Alembert, UMR 7190 CNRS, Case 162, Tour 55, Place Jussieu 4, F-75252 Paris Cedex 05, France |