Ferreira, Adeval Lino, and Kalel Bispo Gimenez Araujo. “Stability of the Epidemiological Model SIR With Loss of Immunity”. Semina: Ciências Exatas e Tecnológicas 44 (September 11, 2023): e47860. Accessed November 21, 2024. https://ojs.uel.br/revistas/uel/index.php/semexatas/article/view/47860.