00509naa#a2200169#i#450# EN\\bibl\4752 20240510001456.5 1995-042X 20141210b2014####ek#y0engy0150####ca RUS RU Application of optimization tasks in cluster analysis Journal article CHERKIZOVO Russian State University of Tourism and Service 2014 0 с. Journal article local Sdvizhkov Oleg service-rusjournal.editorum.ru