Markič, Miloš, and Mihael Brenčič. “High Arsenic (As) Content in the Upper Miocene Coal Matter from TER-1 03 Borehole (Terbegovci - Sveti Jurij Ob Ščavnici, NE Slovenia)”. Geologija, vol. 57, no. 1, June 2014, pp. 15-25, https://doi.org/10.5474/geologija.2014.002.