The Application of a Digital Educational Resource to the Learning Disability of Subtraction: A Case Study. Revista Electrónica Educare, [S. l.], v. 20, n. 1, p. 1–22, 2016. DOI: 10.15359/ree.20-1.13. Disponível em: https://www.revistas.una.ac.cr/index.php/EDUCARE/article/view/7504.. Acesso em: 28 apr. 2024.