KAROUMI, A. Y. The Effect of Collective Competition Strategy on Achievement in Mathematics By Special Education Pupils. Journal of Tikrit University for Humanities, [S. l.], v. 26, n. 9, p. 407–445, 2019. DOI: 10.25130/jtuh.26.9.2019.19. Disponível em: https://jtuh.org/index.php/jtuh/article/view/853. Acesso em: 2 nov. 2026.