00747naa#a2200205#i#450# EN\INFRA-M\bibl\47872 20240429223513.1 1998-0728 20211228b2021####ek#y0engy0150####ca RU Collective Classes in a Group of Different Ages Based on the Integration of the Content of Different Academic Subjects Journal article Moscow INFRA-M Academic Publishing LLC. 2021 3 с. Journal article local Образование. Воспитание. Обучение. Организация досуга. 37 Aristarhova O. Yu. Dvoryankina Yu. V. Osipova E. A. Lebedincev V. B. naukaru.ru