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عبد القادر اعا, منير اعا. The Effect Of Special Exercises for Attention Concentration on Learning Overhead pass in volleyball for sophomore students of physical Education & Sport Sciences College. jope [Internet]. 2020 Jan. 31 [cited 2021 Nov. 29];31(3):19-28. Available from: https://jcope.uobaghdad.edu.iq/index.php/jcope/article/view/855