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. 2022 Apr 22;598:127429. doi: 10.1016/j.physa.2022.127429

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Fig. 5 — Impacts of weak-immune vaccination with $k = 0.1$ and $b = 5 \times 1 0^{- 2}$ . (a) $σ = 0$ and (b) $σ = 2$ .