U-THAISAENG, P. . The Development of an Instructional Model to Promote the Ability to Solve Mathematical Problems for for Nineth Grade Students. Journal of Roi Et Rajabhat University, [S. l.], v. 14, n. 2, p. 63–75, 2020. Disponível em: https://so03.tci-thaijo.org/index.php/reru/article/view/207883. Acesso em: 6 may. 2024.