GADIONENKO, A. Y. Resonance vibrations and rotations of a pendulum with a vibrating point of suspension. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 18, n. 2, p. 102–106, 1966. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8721. Acesso em: 6 dec. 2025.