KHUMKHONG, P.; UGSORNKID, S.; SOMCHAIPENG, T. Effects of Using Open Approach on Mathematical Problem-Solving Ability of Arithmetic Series of 11th Grade Students. Interdisciplinary Academic and Research Journal , Maha Sara Kham, TH., v. 4, n. 5, p. 437–452, 2024. DOI: 10.60027/iarj.2024.278069. Disponível em: https://so03.tci-thaijo.org/index.php/IARJ/article/view/278069. Acesso em: 1 oct. 2026.