Qusay, Waleed, and Laith Faris. β€œAn Analysis of Some Motor Variables of Butterfly Stroke and Their Relationship to Success in the 50-Meter Butterfly Race for National Team Swimmers (candidate Category)”. Journal of Physical Education 34, no. 4 (December 28, 2022): 451–464. Accessed June 30, 2026. https://www.jcope.uobaghdad.edu.iq/index.php/jcope/article/view/1364.