Markič, Miloš. “High Arsenic (As) Content in Coals from Neogene Deposits of the Pannonian Basin in Slovenia”. Geologija 60, no. 2 (December 31, 2017): 173–180. Accessed May 25, 2022. https://www.geologija-revija.si/index.php/geologija/article/view/1398.