Kalinin, E. ., V. . Kuzmichev, A. . Khomyakova, and A. . Leksakov. “CHARACTERISTICS OF COMPETITIVE ACTIVITY OF FOOTBALL PLAYERS OF VARIOUS PLAYING ROLES IN YOUTH NATIONAL TEAMS”. Theory and Practice of Physical Culture, no. 12, Dec. 2022, http://tpfk.ru/index.php/TPPC/article/view/461.