Obando Z, Gilberto, Carlos Eduardo Vasco, and Luis Carlos Arboleda. 2023. “The Teaching and Learning of Ratio, Proportion and Proportionality: The State of the Art”. Revista Latinoamericana de Investigación en Matemática Educativa 17 (1): 59-81. https://doi.org/10.12802/relime.13.1713.