Existence of Periodic Solutions in Impulsive Differential Equations. Journal of Nonlinear Modeling and Analysis, [S. l.], v. 3, n. 1, p. 53–70, 2024. DOI: 10.12150/jnma.2021.53. Disponível em: https://www.global-sci.com/index.php/jnma/article/view/13585. Acesso em: 6 dec. 2025.