00640naa#a2200181#i#450# EN\INFRA-M\bibl\40980 20241101033944.5 2500-3305 20201202b2020####ek#y0engy0150####ca RU Self-development trends at the present stage of modernization of additional education Journal article Moscow INFRA-M Academic Publishing LLC. 2020 4 с. Journal article local Образование. Воспитание. Обучение. Организация досуга. 37 Konnonova A. Yu. Brakk T. A. zh-szf.ru