00649naa#a2200193#i#450# EN\\bibl\127208 20260709013952.4 2712-7516 20260708b2026####ek#y0engy0150####ca RU The legal nature and classification of transactions in Russian civil law Journal article Moscow ITBO University 2026 0 с. Journal article local Гражданско-правовые действия. Сделки. 347.132 Demchenko Irina Anatol'evna Kulkina Irina Vasilyevna Zakalyapin Denis Vladimirovich jomeam.ru