VALLEJO, F. A.; TAMAYO, Óscar E. Difficulties of eight grade students in treatment and conversion of rational number processes. Latinoamericana de Estudios Educativos, [S. l.], v. 4, n. 2, p. 151–182, 2008. Disponível em: https://revistasojs.ucaldas.edu.co/index.php/latinoamericana/article/view/5740. Acesso em: 22 jul. 2024.