“Effect of the form of an underground opening and types of support machine utilization for construction of underground spaces in the coal mines: Effect of the form of an underground opening and types of support machine utilization for construction of underground spaces in the coal mines”, ume, no. 18, pp. 49–53, June 2011, Accessed: Nov. 14, 2026. [Online]. Available: https://ume.rgf.bg.ac.rs/index.php/ume/article/view/92