00494naa#a2200169#i#450# EN\INFRA-M\bibl\4900 20250111060548.6 1998-0728 20150216b2015####ek#y0engy0150####ca RUS RU System-and-Activity-Based Approach in Teaching to Primary Schoolchildren Journal article Moscow INFRA-M Academic Publishing LLC. 2015 6 с. Journal article local Mylnikova N. naukaru.ru