CHRISTOV, O. Remark on the non-integrability of the perturbed motion of the particle in a central field in constant curvature spaces. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 93, p. 25–30, 2001. Disponível em: https://stipendii.uni-sofia.bg/index.php/fmi/article/view/199. Acesso em: 4 dec. 2024.