Brizuela B, Alvarado M. First graders’ work on additive problems with the use of different notational tools. Revista IRICE [Internet]. 1 de agosto de 2010 [citado 8 de mayo de 2024];21(21):37-43. Disponible en: https://ojs.rosario-conicet.gov.ar/index.php/revistairice/article/view/v21n21a04