On the dynamics of SVIR model with Caputo and modified Mittag–Leffler fractional derivatives. Nonlinear Studies, [S. l.], v. 32, n. 4, p. 1321–1346, 2025. Disponível em: https://www.nonlinearstudies.com/index.php/nonlinear/article/view/4082. Acesso em: 14 jan. 2026.