Existence and Non-Existence of Positive Solutions for a Discrete Fractional Boundary Value Problem. Journal of Nonlinear Modeling and Analysis, [S. l.], v. 5, n. 3, p. 432–445, 2024. DOI: 10.12150/jnma.2023.432. Disponível em: https://www.global-sci.com/index.php/jnma/article/view/13694. Acesso em: 5 dec. 2025.