00720naa#a2200193#i#450# EN\\bibl\44176 20240429114716.1 2542-1840 20210519b2021####ek#y0engy0150####ca RU Extracurricular Activities as a Condition for the Intellectual Development of Young Teenagers Journal article Kemerovo Kemerovo State University 2021 10 с. Journal article local Образование. Воспитание. Обучение. Организация досуга. 37 Michurina Elena Sergeevna Kozhevnikova Elvira Eduardovna Tuzhilkin Sergey Aleksandrovich jcenter.kemsu.ru