Summary
The existence of periodic solutions of the equation
is established. This equation arises in the study of the spread of a disease which does not induce permanent immunity.
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Gripenberg, G. Periodic solutions of an epidemic model. J. Math. Biology 10, 271–280 (1980). https://doi.org/10.1007/BF00276986
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DOI: https://doi.org/10.1007/BF00276986