Markič, Miloš, Zora Kalan, Jože Pezdič, and Jadran Faganeli. “H/C Versus O/C Atomic Ratio Characterization of Selected Coals in Slovenia”. Geologija 50, no. 2 (December 31, 2007): 403–426. Accessed April 24, 2024. https://www.geologija-revija.si/index.php/geologija/article/view/1128.