Aranda , Carmen, and M. Luz Callejo. “CONSTRUCTION OF THE CONCEPT OF LINEAR DEPENDENCE IN A CONTEXT OF DYNAMIC GEOMETRY: A CASE STUDY”. Revista Latinoamericana de Investigación en Matemática Educativa, vol. 13, no. 2, June 2010, pp. 129-58, https://www.relime.org/index.php/relime/article/view/316.