00645naa#a2200193#i#450# EN\\bibl\12914 /en/manage/index 20250228060639.5 1999-5644 20160915b2016####ek#y0engy0150####ca RUS RU CONDITIONS AND PREREQUISITES OF DEVELOPMENT OF CLUSTERS IN THE SPHERE OF YOUTH TOURISM IN THE NORTH-WEST FEDERAL DISTRICT Journal article CHERKIZOVO Russian State University of Tourism and Service 2016 8 с. Journal article local Grishin Sergey Karpova Galina test.editorum.ru /en/manage/index