00525naa#a2200169#i#450# EN\\bibl\7968 20241113182057.3 1995-042X 20151126b2015####ek#y0engy0150####ca RUS RU Marketing of educational services in tourism under modernization of Russian education Journal article CHERKIZOVO Russian State University of Tourism and Service 2015 9 с. Journal article local Stepanova Svetlana naukaru.ru