srivilai, sirikwan, Kiat Sangaroon, and Sampan Thinwingthong. 2023. “Teachers’ Knowledge of Student Learning in Secondary Mathematics Classroom Using Lesson Study and Open Approach”. Mahachula Academic Journal 10 (3). Bangkok, Thailand:177-92. https://so04.tci-thaijo.org/index.php/JMA/article/view/263830.