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Quality Production Improvement - QPI > 2021 > Vol. 3, Iss. 1 > 270--282
Nafta-Gaz > 2011 > R. 67, nr 5 > 307-309
Archives of Mining Sciences > 2010 > Vol. 55, no 2 > 295-312
Archives of Mining Sciences > 2008 > Vol. 53, no 1 > 97-114