00535naa#a2200193#i#450# EN\\bibl\13055 20250226071539.3 2071-2367 20160829b2016####ek#y0engy0150####ca RUS RU Cluster analysis of small and middle business in the regions of Russia Journal article Moscow RANEPA 2016 8 с. Journal article local Ivanov Khristo Sibirskaya YElyena Sheremet Natalya naukaru.ru