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Submitted on: 19 July 2021.
Revised on: 11 September 2021.
Accepted on: 17 October 2021.
___________________Acta Montanistica Slovaca---BERG FAC TECHNICAL UNIV KOSICE
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http://reply.papertrans.cn/1/4/389/389-35.png
Submitted on: 30 April 2018.
Revised on: 27 June 2018.
Accepted on: 12 July 2018.
___________________Acta Montanistica Slovaca---BERG FAC TECHNICAL UNIV KOSICE