@ARTICLE{Kopacz_Michał_The_2017, author={Kopacz, Michał}, number={No 3}, journal={Archives of Mining Sciences}, howpublished={online}, year={2017}, publisher={Committee of Mining PAS}, title={The Impact of Variability of Selected Geological and Mining Parameters on the Value and Risks of Projects in the Hard Coal Mining Industry}, URL={http://www.journals.pan.pl/Content/105601/PDF/10267-Volume62_Issue3-08_paper.pdf}, doi={10.1515/amsc-2017-0040}, }