Abou El-Magd, Hassan Ibrahim, and Mohammed Abd-elwahab Elbadry. “Development of the Kinematic Effectiveness of Negative Acceleration Phase of 100 Meter Sprinters”. Journal of Applied Sports Science 7, no. 3 (December 1, 2017). Accessed November 13, 2019. http://jass.alexu.edu.eg/index.php/JASS/article/view/208.