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A. I. Tikhonov
LTD "SRI geological and geoenvironmental problems" (LTD «NIIGiGEP), Akademika Korolyova Str., Bld. 1, Office 13, Cheboksary 428023, Russia
Russian Federation
I. S. Kopylov
Natural Sciences Institute of the Perm State University, 4 Genkelya Str., Perm 614990, Russia
Russian Federation
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