00695naa#a2200181#i#450# EN\\bibl\127432 20260709102638.4 1994-4683 20230930b2023####ek#y0engy0150####ca RU IMPROVING THE EFFECTIVENESS OF THE FIRST SWIMMING MOVEMENTS IN 13-14- YEAR-OLD SWIMMERS Journal article Moscow National State University of Physical Education, Sports and Health named after P.F. Lesgaft 2023 3 с. Journal article local Вольный стиль. Кроль, например,. 797.212.4 Ivchenko Elena Viktorovna Fedorov Pavel Olegovich uchzapiski.lesgaft.spb.ru