Existence and Uniqueness of Solutions for the Initial Value Problem of Fractional $q_k$-Difference Equations for Impulsive with Varying Orders. Journal of Nonlinear Modeling and Analysis, [S. l.], v. 4, n. 4, p. 701–721, 2024. DOI: 10.12150/jnma.2022.701. Disponível em: https://www.global-sci.com/index.php/jnma/article/view/13666. Acesso em: 5 dec. 2025.