Lasa, A., Belloso, N., & Abaurrea, J. (2017). Long live to triangles! Dynamic models for trigonometry. Revista Do Instituto GeoGebra Internacional De São Paulo. ISSN 2237-9657, 5(2), 30–55. Recuperado a partir de https://revistas.pucsp.br/index.php/IGISP/article/view/28630