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

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Fig. 3 — Impacts of weak-immune vaccination with $k = 0.9$ and $b = 1 0^{- 3}$ . (a) $S$ , (b) $V$ (c) $R$ and (d) $I$ .