@ARTICLE{Wierzbicki_Mirosław_The_2014, author={Wierzbicki, Mirosław and Skoczylas, Norbert}, number={No 4}, journal={Archives of Mining Sciences}, howpublished={online}, year={2014}, publisher={Committee of Mining PAS}, title={The Outburst Risk as a Function of the Methane Capacity and Firmness of a Coal Seam}, URL={http://www.czasopisma.pan.pl/Content/93725/PDF/10267-Volume59_Issue4-12_paper.pdf}, doi={10.2478/amsc-2014-0070}, }