Somboon, N. ., Thongkamsuk, P. ., Srihamee , S. . and Iamsa-ard, A. . (2023) “The Development to Problem Solving Ability in Mathematics through the Constructivist Theory with Open Approach of Mathayomsuksa 3 Students”, Suan Dusit Graduate School Academic Journal. Bankok, Thailand, 19(3), pp. 1–17. available at: https://so19.tci-thaijo.org/index.php/SDUGSAJ/article/view/65 (accessed: 10 April 2025).