Fernandes, José António. “Study of the Quadrilaterals As Geometric Concepts With GeoGebra”. Revista do Instituto GeoGebra Internacional de São Paulo 12, no. 3 (November 28, 2023): 037–053. Accessed July 17, 2024. https://revistas.pucsp.br/index.php/IGISP/article/view/60496.