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G. Yu. Ponomareva
Perm State University, 15 Bukireva Str., Perm 614990, Russia
Russian Federation
Senior Lecturer, Department of Regional Geology
I. S. Khopta
Perm State University, 15 Bukireva Str., Perm 614990, Russia
Russian Federation
Assistant, Department of Regional Geology
D. D. Kozhanov
Perm State University, 15 Bukireva Str., Perm 614990, Russia
Russian Federation
Assistant, Department of Regional Geology
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