BASTIEN, Guy; ROGALSKI, Marc. Level Sets Lemmas and Unicity of Critical Point of Invariants, Tools for Local Stability and Topological Properties of Dynamical Systems. Sarajevo Journal of Mathematics, [S. l.], v. 8, n. 2, p. 273–282, 2024. DOI: 10.5644/SJM.08.2.08. Disponível em: https://sjm.anubih.ba/index.php/sjm/article/view/264. Acesso em: 18 jan. 2025.