Sánchez Pérez, E.A., L.M. García Raffi, and J.V. Sánchez Pérez. 1999. “The Influence of Conceptual Errors in Mathematics Teaching at University”. Tarbiya, Revista De Investigación E Innovación Educativa, no. 22 (May):61-71. https://revistas-new.uam.es/tarbiya/article/view/19417.