Bielowicz, Barbara, and Jacek Misiak. “The Forms of Occurrence and Geochemistry of Sulfides in Hard Coal Deposits of the Libiąż Beds in the Upper Silesian Coal Basin, Southern Poland”. Geology, Geophysics and Environment 43, no. 2 (January 14, 2018): 109. Accessed July 20, 2024. https://journals.agh.edu.pl/geol/article/view/2471.