SPARAVALO , M. K. Stability and controllability of motion of dynamic systems at a distance from the equilibrium positions . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 44, n. 8, p. 1145–1149, 1992. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8051. Acesso em: 5 dec. 2025.