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Mining – Informatics, Automation and Electrical Engineering > 2015 > R. 53, nr 4 > 16--21 [tekst ang.], 50--55 [tekst pol.]
Journal of Sustainable Mining > 2014 > Vol. 13, iss. 4 > 40--46
Archives of Mining Sciences > 2001 > Vol. 46, nr 2 > 119-137