Conejo Garrote, Laura, Matías Arce Sánchez, and Tomás Ortega del Rincón. 2015. “An Analysis of Derivability theorems’ Justifications in Textbooks from the 70’s Spanish Education Law”. Advances of Research in Mathematics Education, no. 8 (November): 51-71. https://doi.org/10.35763/aiem.v1i8.117.