Periodic Solutions of Certain Higher Order Autonomous Differential Equations via Topological Degree Theory. Advances in the Theory of Nonlinear Analysis and its Application, [S. l.], v. 7, n. 5, p. 193–205, 2023. DOI: 10.17762/atnaa.v7.i5.335. Disponível em: https://atnaea.org/index.php/journal/article/view/335.. Acesso em: 27 may. 2026.