00490naa#a2200169#i#450# EN\INFRA-M\bibl\14648 20240702154555.2 2500-0527 20161015b2016####ek#y0engy0150####ca RUS RU Economic concentration as an object of scientific research Journal article Moscow INFRA-M Academic Publishing LLC. 2016 0 с. Journal article local Chistyakova Anastasiya zh-szf.ru