1. University of Helsinki, Department of Chemistry, P.O. Box 55 (A.I. Virtanens plats 1), FIN-00014 University of Helsinki, Finland
2. Kazan Federal University, Republic of Tatarstan, Russia
3. Tomsk State University, 36 Lenin Avenue, Tomsk 634050, Russia
4. Laboratory of Applied Mathematics and Theoretical Physics, TUSUR, Lenin ave. 40, 634050 Tomsk, Russia