00627naa#a2200181#i#450# EN\\bibl\96932 20250421081636.1 2073-5537 20250331b2025####ek#y0engy0150####ca RU The role of digital transformation in the development of the service sector Journal article Astrakhan Astrakhan State Technical University 2025 7 с. Journal article local Факторы экономического развития. 330.341 Kalchuk Andrey Yur'evich Salikov Yuri Alexandrovich vestnik.astu.org