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. 2011 Feb 10;240(11):943–948. doi: 10.1016/j.physd.2011.02.001

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Copyright © 2011 Elsevier B.V. All rights reserved.

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Fig. 6 — (Color online) The final number of infections $\bar{n}$ versus the transmission rate $β$ for the uniform case (a) and the preferential case (b). Here $μ = 0.1, c = 1.0, δ = 0.9$ .