Abstract
The S → I → R epidemic model of K. Dietz with annual oscillation in the contact rate is shown to have multiple stable subharmonic solutions of different integral year periods.
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Smith, H.L. Multiple stable subharmonics for a periodic epidemic model. J. Math. Biology 17, 179–190 (1983). https://doi.org/10.1007/BF00305758
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DOI: https://doi.org/10.1007/BF00305758