Celis-Galán, Dolky José. “Teaching Mathematics for Sustainable Development in Official Educational Institutions: Theoretical and Argumentative Contributions Based on the Key Competence of Problem Solving”. Nexus: Multidisciplinary Research Journal, vol. 2, no. 4, Dec. 2025, pp. 154-72, https://nexushouseeditorial.com/index.php/nexus/article/view/66.