Ali Abdulameer Hussein, Maytham Fakhri Al-Hammadi, Abbas Khaleel Mohammed,. “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. 4820-8, https://archives.palarch.nl/index.php/jae/article/view/7047.