BUAN, A.; TUMAMPIL, L. Development of performance task activity in teaching systems of linear equation. The Mindanawan Journal of Mathematics, [S. l.], v. 2, n. 1, p. 11–18, 2011. Disponível em: https://journals.msuiit.edu.ph/tmjm/article/view/13. Acesso em: 18 oct. 2024.