TY - JOUR L1 - http://journals.pan.pl/Content/105510/PDF/10267-Volume61_Issue2-01_paper.pdf L2 - http://journals.pan.pl/Content/105510 PY - 2016 IS - No 2 DO - 10.1515/amsc-2016-0016 A1 - Trutwin, Waclaw PB - Committee of Mining PAS DA - 2016 T1 - In Memoriam UR - http://journals.pan.pl/dlibra/publication/edition/105510 T2 - Archives of Mining Sciences ER -