Kovbasa, VolodymirVolodymirKovbasaYavorska, O.O.O.O.YavorskaTokar, L.O.L.O.Tokar2017-03-282017-03-282013http://ir.nmu.org.ua/handle/123456789/148844enDrilling a Ventilation Hole in “Yubileinaia” Mine of “DTek Pavlogradugol” PJSCArticle