Ferreira, Adeval Lino, and Kalel Bispo Gimenez Araujo. 2023. “Stability of the Epidemiological Model SIR With Loss of Immunity”. Semina: Ciências Exatas E Tecnológicas 44 (September):e47860. https://doi.org/10.5433/1679-0375.2023.v44.47860.