Margalef-Ciurana, I. and García-Tamarit, C.trans. 2016. The Application of a Digital Educational Resource to the Learning Disability of Subtraction: A Case Study. Revista Electrónica Educare. 20, 1 (Jan. 2016), 1–22. DOI:https://doi.org/10.15359/ree.20-1.13.