00497naa#a2200169#i#450# EN\\bibl\588 20260121150853.3 2073-0462 20131024b2013####ek#y0engy0150####ca RUS RU Classification of costs for management reporting formation in gas producing companies Journal article Kazan Kazan state agrarian University 2013 4 с. Journal article local Gorobets Olga zh-szf.ru