Mederos, Otilio B., Carlos Negrón, José L. Sánchez, and José M. Sigarreta. “Classifications and Construction of the Concept of Punctual Discontinuity: Clasificaciones Y construcción Del Concepto De Discontinuidad Puntual”. Mathematics, Education and Internet Journal 21, no. 1 (February 21, 2022). Accessed April 25, 2024. https://revistas.tec.ac.cr/index.php/matematica/article/view/5344.