E. M Sulman - Tver Technical University, Tver, 170026, Russian Federation
V. G Matveeva - Tver Technical University, Tver, 170026, Russian Federation
L. M Bronstein - Indiana University Bloomington
M. G Sulman - Tver Technical University, Tver, 170026, Russian Federation
V. D Doluda - Tver Technical University, Tver, 170026, Russian Federation
A. V Tokarev - Åbo Akademi University
E. V Murzina - Åbo Akademi University
D. Yu Murzin - Åbo Akademi University