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Proceedings of ECOpole > 2018 > Vol. 12, No. 1 > 95--103
Journal of Sustainable Mining > 2013 > Vol. 12, iss. 4 > 6--13
Proceedings of ECOpole > 2018 > Vol. 12, No. 1 > 95--103
Journal of Sustainable Mining > 2013 > Vol. 12, iss. 4 > 6--13