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. [Internet]. 2001 Dec. 12 [cited 2024 Dec. 4];93:25-30. Available from: https://stipendii.uni-sofia.bg/index.php/fmi/article/view/199