@ARTICLE{Czaja_Piotr_Hybrid_2014, author={Czaja, Piotr and Tajduś, Antoni and Kamiński, Paweł and Klich, Jerzy}, number={No 3}, journal={Archives of Mining Sciences}, howpublished={online}, year={2014}, publisher={Committee of Mining PAS}, title={Hybrid Technology of Hard Coal Mining from Seams Located at Great Depths}, URL={http://journals.pan.pl/Content/93587/PDF/10267-Volume59_Issue3-01_paper.pdf}, doi={10.2478/amsc-2014-0041}, }