Method and equipment for the safe development of preparatory workings in the gas-bearing coal seamsMykola Trokhymets, Vira Maltseva, Yehor Vialushkin, Volodymyr Antonchik, Tetiana Moskalova and Maryna PolushynaE3S Web Conf., 109 (2019) 00102DOI: https://doi.org/10.1051/e3sconf/201910900102