Ali Abdulameer Hussein, M. F. A.-H. A. K. M. . “The Effect of Intensive Tempo Training in Development of Speed Endurance, Some Physiological Indicators, and 800-Meter Performance in 20 Years Runners”. PalArch’s Journal of Archaeology of Egypt / Egyptology, vol. 18, no. 4, Mar. 2021, pp. 4820 -28, https://archives.palarch.nl/index.php/jae/article/view/7047.