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O. V. Kletskina
Perm State University
15 Bukireva Str., Perm 614990, Russia
Russian Federation
scientist
P. A. Krasilnikov
Perm State University
15 Bukireva Str., Perm 614990, Russia
Russian Federation
Dr.geol.-min.sci., Prof.
A. V. Tatarkin
Perm State University
15 Bukireva Str., Perm 614990, Russia
Russian Federation
dr.tech.sci., Prof.
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