Pavlović, V., Šubaranović, T., & Bošković, S. (2011). Possibilities for application of coal mining by rotary drilling at the opencast mine Gračanica-Gacko. Podzemni Radovi, (18), 77-83. Retrieved from https://ume.rgf.bg.ac.rs/index.php/ume/article/view/96