Tran, T. ., Nguyen, N.-G. ., Bui, M.-D. ., & Phan, A.-H. . (2014). Discovery Learning with the Help of the GeoGebra Dynamic Geometry Software . International Journal of Learning, Teaching and Educational Research, 7(1), 44–57. Retrieved from https://ijlter.net/index.php/ijlter/article/view/1170