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| ISSN 0536-1028 (Print) ISSN 2686-9853 (Online) |
Olga S. Valieva
Senior lecturer of the Mining Department, Mirny Polytechnic Institute (Branch) of North-Eastern Federal University. Е-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
This email address is being protected from spambots. You need JavaScript enabled to view it.
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