00504naa#a2200157#i#450# EN\\bibl\76034 20240514202700.2 2500-3372 20240320b2024####ek#y0engy0150####ca RU Development of Media Holding in the Context of the Dual Media Services Market Formation Journal article Kemerovo Kemerovo State University 2024 11 с. Journal article local Gorelkina Anastasiya Viktorovna jcenter.kemsu.ru