Positive Solutions of Second-Order Difference Equation with Variable Coefficient on the Infinite Interval. Journal of Nonlinear Modeling and Analysis, [S. l.], v. 4, n. 4, p. 658–676, 2024. DOI: 10.12150/jnma.2022.658. Disponível em: https://global-sci.com/index.php/jnma/article/view/13663. Acesso em: 6 dec. 2025.