00510naa#a2200169#i#450# EN\INFRA-M\bibl\153 20251226070309.5 2587-6279 20130329b2013####ek#y0engy0150####ca RUS RU Estimation of Company Participation Cost in International Oil & Gas Projects Journal article Moscow INFRA-M Academic Publishing LLC. 2013 0 с. Journal article local Demkin Igor Vyacheslavovich zh-szf.ru