LI, Junyi. Exact and Approximate Formulae for the Period of Simple Pendulum. Highlights in Science, Engineering and Technology, [S. l.], v. 72, p. 108–112, 2023. DOI: 10.54097/sen92159. Disponível em: https://drpress.org/ojs/index.php/HSET/article/view/12909. Acesso em: 1 aug. 2026.