1. Syktyvkar State University, Oktyabrsky Prospect, 55, Syktyvkar 167001, Russia
2. Institute of Geology of the Komi Science Center UB RAS, Pervomaiskaya st. 48, Syktyvkar 167982, Russia
3. Saint Petersburg State University, University Emb. 7/9, St. Petersburg 199034, Russia
4. Institute of Physics and Mathematics of the Komi Science Center UB RAS, Oplesnina st. 4, Syktyvkar, Republic of Komi 167982, Russia
5. University of Illinois Chicago, 845 W. Taylor St., MC 111, Chicago, Illinois 60607, United States