KUMMOD, A.; ART-IN, S. The Development of Mathematics Problem Solving Ability for Grade 12 Students Through Open Approach with Polya’s Problem Solving Process. Journal of Education Khon Kaen University (Graduate Studies Research), [S. l.], v. 13, n. 2, p. 125–135, 2019. Disponível em: https://so02.tci-thaijo.org/index.php/EDGKKUJ/article/view/216861. Acesso em: 27 apr. 2024.