HUSSEIN, Loai. The Effect of Proposed Exercises In Reducing The Proportion of Constant and Variable Errors in Tennis Flat Serve. Journal of Physical Education, Baghdasd, Iraq., v. 28, n. 2, p. 402–417, 2016. DOI: 10.37359/JOPE.V28(2)2016.293. Disponível em: https://jcope.uobaghdad.edu.iq/index.php/jcope/article/view/293.. Acesso em: 8 may. 2024.