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B. M. Osovetsky
Perm State University, 15 Bukireva Str., Perm 614990, Russia
Russian Federation
Dr. Geol.-Min. Sci., Professor of Department of Mineralogy and Petrography
Yu. G. Paktovsky
Perm State University. 15 Bukirev Str., Perm 614990, Russia
Russian Federation
cand.geol.-min.sci. Docent of Mineralogy and Petrography Department
V. A. Chuyko
Almining Ltd.
Russian Federation
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