00485naa#a2200169#i#450# EN\INFRA-M\bibl\10427 20240420100604.6 2308-4898 20151217b2015####ek#y0engy0150####ca RUS RU Subject Olympiads As an Indicator of the Quality of Education Journal article Moscow INFRA-M Academic Publishing LLC. 2015 9 с. Journal article local Sal'kov N. A. riorpub.com