PÉREZ-VILLALBA, M.; GARCÍA-FERNÁNDEZ, J.; GÓMEZ-CHACÓN, R.; FERNÁNDEZ-MARTÍNEZ, N. Group exercise training in sport centers and its value as a retention element. SPORT TK-EuroAmerican Journal of Sport Sciences, [S. l.], v. 7, n. 2, p. 17–26, 2018. DOI: 10.6018/sportk.343061. Disponível em: https://revistas.um.es/sportk/article/view/343061. Acesso em: 2 nov. 2026.