Polrach S, Nontapa N. A Study of Teachers’ Beliefs and Ability to Solve Mathematical Problems of Lower Secondary School Students Under Mahasarakham Provincial Administrative Organization. edurmu [internet]. 2023 Aug. 28 [cited 2026 Sep. 12];20(2):73-8. available from: https://so06.tci-thaijo.org/index.php/edu-rmu/article/view/259500