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Periodic solutions of an epidemic model
Journal of Mathematical Biology, 1980The existence of periodic solutions of the equation (see formula in text) is established. This equation arises in the study of the spread of a disease which does not induce permanent immunity.
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Existence of periodic solutions and almost periodic solutions
1991Yoshiyuki Hino +2 more
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Existence of periodic solutions
Communications on Pure and Applied Mathematics, 1967openaire +2 more sources