Prof. Dr. Maher Abdul Hamza Hardan, A. L. R. A. F. D. P. H. I. K. A. . “Effects of Compound Exercises on the Level of Difficulty of Squash Players’ Volley Stroke Accuracy Indicator”. Annals of the Romanian Society for Cell Biology, vol. 25, no. 6, May 2021, pp. 5897-05, https://annalsofrscb.ro/index.php/journal/article/view/6608.