Lepikhina O. Yu. (PhD in tech.sc., associate professor, Saint Petersburg mining university)
Baltyzhakova T. I. (PhD in tech.sc., assistant, Saint Petersburg mining university)
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Lepikhina O. Yu. (PhD in tech.sc., associate professor, Saint Petersburg mining university)
Baltyzhakova T. I. (PhD in tech.sc., assistant, Saint Petersburg mining university)
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