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Stability and Bifurcation Analysis of Logistically Grown SIR Model with External Infection Effect of the Susceptible Class and Effect of Loss of Immunity of the Recovered Class. J. Int. Acad. Phys. Sci. [Internet]. 2015 Sep. 15 [cited 2026 Oct. 23];19(3):191-204. Available from: http://www.iaps.org.in/journal/index.php/journaliaps/article/view/324