SHVETS, A. Yu. Deterministic chaos of a spherical pendulum under limited excitation. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 59, n. 4, p. 534–548, 2007. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3327. Acesso em: 5 dec. 2025.