Possibilities for application of coal mining by rotary drilling at the opencast mine Gračanica-Gacko: Mogućnost primene eksploatacije uglja rotacionim bušenjem na površinskom kopu Gračanica-Gacko. ume [Internet]. 2011 June 30 [cited 2026 Nov. 15];(18):77-83. Available from: https://ume.rgf.bg.ac.rs/index.php/ume/article/view/96