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M. V. Fyodorov
Perm State University, 15 Bukireva Str., Perm 614990, Russia
Russian Federation
assistant
V. V. Seredin
Perm State University, 15 Bukireva Str., Perm 614990, Russia
Russian Federation
Head of Department of geological engineering and conservation of resources, Dr., Prof.
I. V. Lunegov
Perm State University, 15 Bukireva Str., Perm 614990, Russia
Russian Federation
assistant
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