VISEU, Floriano; PIRES, Ana Luisa; MENEZES, Luís; COSTA, Ana Maria. Semiotic Representations in The Learning of Rational Numbers by 2nd Grade Portuguese Students. International Electronic Journal of Elementary Education, [S. l.], v. 13, n. 5, p. 611–624, 2021. Disponível em: https://www.iejee.com/index.php/IEJEE/article/view/1453. Acesso em: 13 sep. 2026.