00515naa#a2200169#i#450# EN\\bibl\8116 20240502215706.4 1999-5644 20151201b2015####ek#y0engy0150####ca RUS RU Essence of the concept «educational tourism» and its basic principles Journal article CHERKIZOVO Russian State University of Tourism and Service 2015 5 с. Journal article local Guseynova Alena rguts.editorum.ru