00479naa#a2200169#i#450# EN\INFRA-M\bibl\12403 20241008112051.2 2500-3305 20160625b2016####ek#y0engy0150####ca RUS RU Formation of educational activity of younger schoolboys Journal article Moscow INFRA-M Academic Publishing LLC. 2016 0 с. Journal article local Granichina O. naukaru.ru