Jawad, AlaaFlayyih, et al. “The Effect of Multi-Tempo Training According to the Race Constant in Enduring Speed, Lactic Acid, Maximum Oxygen Consumption and Achievement for 1500m Runners under 20 Years Old”. International Journal of Psychosocial Rehabilitation, vol. 24, no. 3, May 2020, pp. 7264-73, https://doi.org/10.61841/3f7wgt88.