00544naa#a2200169#i#450# EN\\bibl\81077 20250428020600.1 2221-3260 20240131b2024####ek#y0engy0150####ca RU On the issue of substantive characteristics of the virtual economy Journal article Yaroslavl Yaroslavl State Technical University 2024 11 с. Journal article local Ivantsov Yuri Alexandrovich Nalivaichenko Ekaterina Vladimirovna ystu.editorum.ru