Lyapunov-Type Inequalities for a System of Nonlinear Differential Equations. Communications in Mathematical Research, [S. l.], v. 33, n. 3, p. 205–214, 2019. DOI: 10.13447/j.1674-5647.2017.03.02. Disponível em: https://global-sci.com/index.php/cmr/article/view/8928. Acesso em: 5 dec. 2025.