Mahmoud, Mohammed. 2015. “The Effect Exercises Using a Rubber Cords in Developing Explosive Strength of Muscles of Legs and Arms and Some Chemical Indicators Elbio Handball Goalkeeper (ages 13-14 Years)”. Journal of Physical Education 27 (3): 188-209. https://doi.org/10.37359/JOPE.V27(3)2015.626.