00558naa#a2200169#i#450# EN\\bibl\124885 20260604023212.4 2221-3260 20260331b2026####ek#y0engy0150####ca RU Theoretical and Methodological approach to forming a National Export Support System Journal article Yaroslavl Yaroslavl State Technical University 2026 12 с. Journal article local Andreeva Elena Leonidovna Antonenko Valeriya Mihaylovna theoreticaleconomy.ru