00538naa#a2200169#i#450# EN\\bibl\863 20240516044710.4 1999-5644 20131223b2013####ek#y0engy0150####ca RUS RU The use of technology of master classes at higher schools of Tourism and Service Journal article CHERKIZOVO Russian State University of Tourism and Service 2013 9 с. Journal article local Zaitseva Nataliya Aleksandrovna rguts.editorum.ru