00754naa#a2200181#i#450# EN\\bibl\96121 20250623204322.1 1994-4683 20250620b2025####ek#y0engy0150####ca RU Training of speed-strength qualities in young football players during the preparatory period at the stage of sports mastery development Journal article Moscow National State University of Physical Education, Sports and Health named after P.F. Lesgaft 2025 7 с. Journal article local Футбол. 796.332 Методические основы видов спорта. 77.29 grnti Dmitriev Vladimir Aleksandrovich uchzapiski.lesgaft.spb.ru