00716naa#a2200193#i#450# EN\INFRA-M\bibl\42271 /en/manage/index 20241212182302.4 1998-0728 20210217b2021####ek#y0engy0150####ca RU Research Activities As a Mean of Intellectual Development of Primary Schoolchildren Journal article Moscow INFRA-M Academic Publishing LLC. 2021 8 с. Journal article local Образование. Воспитание. Обучение. Организация досуга. 37 Vinogradova Natalya Fedorovna Rydze Oxana Anatol'evna test.editorum.ru /en/manage/index