VELICHOVA, Daniela. Interactive Maths with GeoGebra. International Journal of Emerging Technologies in Learning (iJET), [S. l.], v. 6, n. S1, p. pp. 31–35, 2011. DOI: 10.3991/ijet.v6iS1.1620. Disponível em: https://online-journals.org/index.php/i-jet/article/view/1620. Acesso em: 2 may. 2024.