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3. Order of Rostekhnadzor dated 01.12.2011 N 679 (as amended on 20.05.2015) “On approval of the Instructions for coal mines degasification” (Registered in the Ministry of Justice of Russia on 29.12.2011 N 22811)
4. Tailakov O.V., Zastrelov D.N., et al., Bulletin of the Scientific Center for the Safety of Work in the Coal Industry, 1, 30 (2016)
5. Ettinger I.A., Gas intensity of fossil coals (Nedra, Moscow, 1966)