Grounding of the criteria of efficiency outburst prevention measures at the opening of coal beds - V. V. Zavrazhin; Ja. V. Shazhko; I. E. Kolchik; A. V. Kravchenko; L. D. Ozhegova; N. Khuangan (Fyzyko-tekhnycheskye problemy hornoho proyzvodstva, 2014)