The volitional preparation in athletes of the school category of boxing. An approach to their study. Revista científica Olimpia, [S. l.], v. 12, n. 38, p. 44–53, 2015. Disponível em: https://revistas.udg.co.cu/index.php/olimpia/article/view/1349. Acesso em: 7 mar. 2026.