Fernández, Ceneida, and Salvador Llinares. “Implicative Relations Between Strategies Used in Solving Proportional and Non–proportional Problems”. Revista Latinoamericana de Investigación en Matemática Educativa 15, no. 1 (March 1, 2012): 9–33. Accessed October 23, 2026. https://www.relime.org/index.php/relime/article/view/241.