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 [Internet]. 2011 June 30 [cited 2026 Nov. 15];(18):49-53. Available from: https://ume.rgf.bg.ac.rs/index.php/ume/article/view/92