CHRISTOV, O. Bifurcations of invariant manifolds in a model in rigid body dynamics. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 85, p. 123–129, 1993. Disponível em: https://ftl5.uni-sofia.bg/index.php/fmi/article/view/460. Acesso em: 5 dec. 2024.