M. AL-MEKHLAFI, S.; BOUDAOUI, A.; LAKSACI, N.; ABDELJAWAD, T.; ABDALLA, B. Modeling Dengue-COVID-19 Co-Epidemics via Crossover Discrete Time Systems with Variable-Order Fractional Memory. Contemporary Mathematics , [S. l.], v. 7, n. 4, p. 4111–4162, 2026. DOI: 10.37256/cm.7420268949. Disponível em: https://ojs.wiserpub.com/index.php/CM/article/view/8949. Acesso em: 13 aug. 2026.