Dr. Hatem Flayyih Hafidh, Mahmoud Nasser Radhi, Mustafa Hadi Mohammed. “Effect of Visual - Skill Exercises by Auxiliary Means to Development of Motor Response Speed and Learning Blocking Skill for Junior Volleyball Players”. Annals of the Romanian Society for Cell Biology, Apr. 2021, pp. 11751-63, https://www.annalsofrscb.ro/index.php/journal/article/view/4021.