Jiraporn Poonyawatpornkul, Kotchakorn Mangmee, and Onuma Methakeson. 2022. “Oscillation of Full and Partial Ring Pendulum: Physics Laboratory Experiment”. Science & Technology Asia 27 (3):85-94. https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/247441.