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. 2018 Oct 25;117:168–174. doi: 10.1016/j.chaos.2018.10.023

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Fig. 4 — Plots numerical solutions for I(t) such that N=1000, c=0.01, b=0.2, $γ = 0.1,$ I(0)=30, β=0.31 and $α = 0.9$ .