Latif , Abdullah. “The Impact of Proposed Exercises According to Some Biomechanical Variables in the Development of Speed Return the Topspin Serve in Tennis”. Journal of Physical Education 23, no. 4 (December 28, 2011): 28. Accessed July 1, 2026. https://jcope.uobaghdad.edu.iq/index.php/jcope/article/view/1632.