คงภักดี ว. A Study of Mathematical Problem-Solving Ability Via Open Approach Activities. STOU Education Journal, [S. l.], v. 11, n. 2, p. 86–101, 2018. Disponível em: https://so05.tci-thaijo.org/index.php/edjour_stou/article/view/162141. Acesso em: 1 oct. 2026.