00502naa#a2200169#i#450# EN\INFRA-M\bibl\13604 20240802211455.5 2500-3291 20160925b2016####ek#y0engy0150####ca RUS RU Theory and Methodology of Formation of Mining and Chemical Holdings Development Journal article Moscow INFRA-M Academic Publishing LLC. 2016 0 с. Journal article local Putkova A. V. naukaru.ru