Testing of the resistance towards the cutting of the coal mass by the mechanical means on the example of deposit ’Kostolac’: Ispitivanje otpora prema rezanju ugljene mase mehaničkim sredstvima na primeru ležišta ’Kostolac’. (2013). Podzemni Radovi, 23, 59-68. https://ume.rgf.bg.ac.rs/index.php/ume/article/view/51