00506naa#a2200169#i#450# EN\\bibl\4994 20240518172440.6 1995-042X 20141215b2014####ek#y0engy0150####ca RUS RU Service management at the regional level: the cluster approach Journal article CHERKIZOVO Russian State University of Tourism and Service 2014 10 с. Journal article local Bushueva Irina rguts.editorum.ru