Ferreira AL, Araujo KBG. Stability of the Epidemiological Model SIR with Loss of Immunity. Semin., Exact Tech. Scienc. [Internet]. 2023 Sep. 11 [cited 2024 May 11];44:e47860. Available from: https://ojs.uel.br/revistas/uel/index.php/semexatas/article/view/47860