Ajman, Hrvoje, and Zvonimir Tomac. “Differences in Biological Age of the Best U11 and U13 Teams in Croatia”. Journal of Human Sport and Exercise 14, no. 5proc (December 23, 2019): S2375-S2379. Accessed June 23, 2024. https://www.jhse.ua.es/article/view/2019-v14-n5-proc-biological-age-best-u11-u13-teams-croatia.