Jalal, Nadhim. “Mechanical Energy and Its Relationship With Some Kinematical Variables and Scoring Accuracy Indicator in Youth Soccer Players”. Journal of Physical Education 32, no. 3 (September 28, 2020): 131-140. Accessed August 14, 2021. https://jcope.uobaghdad.edu.iq/index.php/jcope/article/view/1029.