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Polish Journal of Management Studies > 2021 > Vol. 24, No. 2 > 119--135
Proceedings of ECOpole > 2017 > Vol. 11, No. 2 > 395--401
Archives of Mining Sciences > 2017 > Vol. 62, no. 3 > 445--457
Archives of Mining Sciences > 2014 > Vol. 59, no. 2 > 413--425
Pomiary Automatyka Kontrola > 2013 > R. 59, nr 9 > 950--953
Pomiary Automatyka Kontrola > 2005 > R. 51, nr 9 bis > 19--21