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Ercegovac, Marko, Bogdan Aleksić, Olga Cvetković, Branislav Marković, Bojana Aleksić, Hans Hagemann, and Dragomir Vitorović. 2000. “Micropetrographic Characteristics of the Kosovo Soft Brown Coal and Their Changes During Catalytic Hydroliquefaction”. Geološki Anali Balkanskoga Poluostrva 63 (1), 237-52. https://gabp.rgf.bg.ac.rs/index.php/gabp/article/view/307.