Khidar, Jamel, and Yassir Maouf. “Effect of Using Different Training Systems On Some Special Physical Abilities in a 50m Youth Freestyle Swimming”. Journal of Physical Education 30, no. 4 (December 28, 2018): 10–39. Accessed June 23, 2026. https://jcope.uobaghdad.edu.iq/index.php/jcope/article/view/424.