Probierz, K. and Kwaśny, M. 2014. Changes of coal rank and petrographic composition of coals from the drillhole BD 57 deposit of "Bzie-Dębina" in the Jastrzębie area (SW part of the Upper Silesian Coal Basin). Geology, Geophysics and Environment. 40, 1 (Mar. 2014), 66. DOI:https://doi.org/10.7494/geol.2014.39.1.66.