1. Department of Quantum Chemistry, St. Petersburg State University, 26 Universitetsky
Avenue, Petrodvorets 198504, Russia
2. Belarusian State University of Informatics and Radioelectronics, 6 P.
Browka Str., Minsk, 220013, Belarus
3. Institute of Solid State Physics, University of Latvia, 8 Kengaraga Str., Riga LV-1063
Latvia