LIRA VÁZQUEZ, Alejandra; CORONA-CORONA, Gulmaro. Period of the Simple Pendulum without Differential Equations. American Scientific Research Journal for Engineering, Technology, and Sciences, Jordan, v. 40, n. 1, p. 125–131, 2018. Disponível em: https://asrjetsjournal.org/American_Scientific_Journal/article/view/3866. Acesso em: 12 oct. 2025.