00473naa#a2200169#i#450# EN\RIOR\bibl\11939 20250131062957.5 2500-1469 20160625b2016####ek#y0engy0150####ca RUS RU Cluster approach in the development of Russian education system Journal article Moscow Publishing Center RIOR 2016 5 с. Journal article local Grigoreva Anna rusjm.ru