MOATIMID, G. M. Sliding bead on a smooth vertical rotated parabola: stability configuration. Kuwait Journal of Science, [S. l.], v. 47, n. 2, 2020. Disponível em: https://journals.ku.edu.kw/kjs/index.php/KJS/article/view/6772. Acesso em: 6 may. 2026.