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), p. 66. doi: 10.7494/geol.2014.39.1.66.