Lira Vázquez, Alejandra, and Gulmaro Corona-Corona. “Period of the Simple Pendulum Without Differential Equations”. American Scientific Research Journal for Engineering, Technology, and Sciences 40, no. 1 (February 22, 2018): 125–131. Accessed May 6, 2024. https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/3866.