00527naa#a2200181#i#450# EN\INFRA-M\bibl\804 20240506202149.1 1998-0728 20131121b2013####ek#y0engy0150####ca RUS RU Assessment of efficiency of schoolchildren’s out-of-school activities Journal article Moscow INFRA-M Academic Publishing LLC. 2013 6 с. Journal article local Moshnina R. Batyreva Svetlana naukaru.ru