00574naa#a2200181#i#450# EN\\bibl\4993 20260326062846.4 1995-042X 20141215b2014####ek#y0engy0150####ca RUS RU Regional tourist complexes and clusters: similarities and main differences Journal article CHERKIZOVO Russian State University of Tourism and Service 2014 14 с. Journal article local Vinogradova Marina Ulyanchenko Lyudmila service-rusjournal.editorum.ru