MAISTRENKO, Yu. L.; POPOVICH, O. V. Existence and stability of periodic solutions for chains of connected oscillators. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 49, n. 7, p. 943–950, 1997. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5085. Acesso em: 5 dec. 2025.