The results of acceptance testing method for evaluating the effectiveness of measures at the opening antiblowout prone to gas dynamic phenomenon steeply inclined coal seam - V. V. Zavrazhin; Ja. V. Shazhko; I. E. Kolchik; A. V. Kravchenko; L. D. Ozhegova; N. Khuangan (Geo-Technical Mechanics, 2015)