thammawiwat, nattapon, A. P. D. K. Sangaroon, and A. P. D. S. Thinwiangthong. “Students’ Creative Problem Solving in Mathematics Classroom Using Lesson Study and Open Approach”. Mahachula Academic Journal, vol. 11, no. 1, Apr. 2024, pp. 148-62, https://so04.tci-thaijo.org/index.php/JMA/article/view/265572.