“ON PERIODIC MOTION OF SIMPLE PENDULUM: "AND YET, IT MOVES”. INTERNATIONAL JOURNAL OF PHYSICS RESEARCH AND DEVELOPMENT (IJPRD) 2, no. 1 (February 11, 2019): 08–18. Accessed February 11, 2026. https://lib-index.com/index.php/IJPRD/article/view/IJPRD_01_01_002.