Teófilo de Sousa, Renata, Francisco Régis Vieira Alves, and Maria José Araújo Souza. 2022. “The Theory of Figural Concepts and GeoGebra: Concept and Visualization in Dynamic Geometry ”. Mathematics, Education and Society 5 (1):1-17. https://journals.uco.es/mes/article/view/13532.