00525naa#a2200169#i#450# EN\\bibl\2171 20241119163559.2 1993-7768 20140603b2014####ek#y0engy0150####ca RUS RU Contemporary Approaches to Classification of Organization- and Company-Consumed Services Journal article CHERKIZOVO Russian State University of Tourism and Service 2014 7 с. Journal article local Povorina Elena naukaru.ru