An SIRS Pulse Vaccination Model with Nonlinear Incidence Rate and Time Delay. Letters in Biomathematics, [S. l.], v. 10, n. 1, p. 133–148, 2023. DOI: 10.30707/. Disponível em: https://lettersinbiomath.org/manuscript/index.php/lib/article/view/169.. Acesso em: 8 jul. 2024.