Sancho-Monllor , B, et al. “BACKGROUND OF NON-SPECIFIC GROIN INJURY AND CONCENTRIC MAXIMUM POWER VALUES IN ADOLESCENT SOCCER PLAYERS”. Cuestiones De Fisioterapia, vol. 49, no. 1, Feb. 2020, pp. 37-47, http://cuestionesdefisioterapia.es/index.php/cf/article/view/124.