00475naa#a2200169#i#450# EN\\bibl\2176 20241119164857.2 1993-7768 20140603b2014####ek#y0engy0150####ca RUS RU Non-Profit Outsourcing in Tourism Journal article CHERKIZOVO Russian State University of Tourism and Service 2014 6 с. Journal article local Petrachkova Zinaida naukaru.ru