00518naa#a2200169#i#450# EN\INFRA-M\bibl\10889 20260206170614.5 2226-7867 20160610b2016####ek#y0engy0150####ca RUS RU Contribution of Labour Migration to the Economy of Russia: Evaluation Methods and Results Journal article Moscow INFRA-M Academic Publishing LLC. 2016 13 с. Journal article local Ryazantsev Sergey naukaru.ru