00535naa#a2200193#i#450# EN\INFRA-M\bibl\3265 20240420190435.6 1998-071X 20140825b2014####ek#y0engy0150####ca RUS RU Coal Рroduction Safety by Risk Indexes Journal article Moscow INFRA-M Academic Publishing LLC. 2014 5 с. Journal article local Khamidullina Elena Timofeeva Svetlana S. Smirnov G. naukaru.ru