VASILEVA, N. Stability of steady-state motions of systems of symmetric rigid bodies with ball-and-socket joints. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 87, p. 337–349, 1995. Disponível em: https://ftl5.uni-sofia.bg./index.php/fmi/article/view/426. Acesso em: 26 apr. 2025.