Tran, Trung, Ngoc-Giang Nguyen, Minh-Duc Bui, and Anh-Hung Phan. “Discovery Learning With the Help of the GeoGebra Dynamic Geometry Software”. International Journal of Learning, Teaching and Educational Research 7, no. 1 (August 30, 2014): 44–57. Accessed April 17, 2026. http://www.ijlter.myres.net/index.php/ijlter/article/view/1170.