00777naa#a2200181#i#450# EN\\bibl\128262 20260728222220.2 1994-4683 20230131b2023####ek#y0engy0150####ca RU ACTUALIZATION OF THE PROBLEM OF FORMATION OF MOTIVATION FOR SPORTS ACHIEVEMENTS IN ADOLESCENTS IN THE SYSTEM OF ADDITIONAL EDUCATION Journal article Moscow National State University of Physical Education, Sports and Health named after P.F. Lesgaft 2023 4 с. Journal article local Общие вопросы дидактики и методики воспитания и обучения. 37.02 Karyakin R E Mezinov Vladimir Nikolaevich uchzapiski.lesgaft.spb.ru