Numerical simulation and fractional-order analysis of COVID-19–Zika co-infection: Impacts of vaccination, treatment, and vector control. Nonlinear Studies, [S. l.], v. 32, n. 4, p. 1465–1499, 2025. Disponível em: https://www.nonlinearstudies.com/index.php/nonlinear/article/view/4146. Acesso em: 13 jan. 2026.