Elghoul, Y., K. . Trabelsi, L. . . . . Masmoudi, A. . . Ben Kahla, M. . A. Souissi, C. . C. T. Clark, O. . Boukhris, J. M. Glenn, and M. . . Frikha. “TRAINING AND FITNESS VARIABILITY IN ELITE YOUTH SOCCER: PERSPECTIVES FROM A DIFFICULTY PREDICTION MODEL”. Kinesiology, vol. 54, no. 1, July 2022, pp. 25-35, https://hrcak.srce.hr/ojs/index.php/kinesiology/article/view/16714.