00516naa#a2200181#i#450# EN\\bibl\5878 20241221060657.6 1999-5644 20150615b2015####ek#y0engy0150####ca RUS RU SPA-services and their regulatory control Journal article CHERKIZOVO Russian State University of Tourism and Service 2015 5 с. Journal article local Zvorykina Tatyana Silcheva Lyudmila naukaru.ru