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. 2021 Jan 7;143:110616. doi: 10.1016/j.chaos.2020.110616

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Fig. 2 — Typical behavior of the epidemiological population, $S = (S_{Q} + S_{N}), I = (I_{Q} + I_{N}), R$ . Note that recurrent infection peaks emerge spontaneously. Here $δ = 10, β_{N} = 10$ .