Ruiz Ledesma, E. F. (2022) “Study of the Schemes Constructed of Ratio and Proportion by Pre-university Students: Using a Teaching Sequence ”, EDU REVIEW. International Education and Learning Review / Revista Internacional de Educación y Aprendizaje, 10(2), pp. 169–184. doi: 10.37467/gkarevedu.v10.3339.