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A class of SIRS epidemiological models with at least two limit cycles. (Chinese. English summary) Zbl 1055.92514
Summary: In this paper, an SIRS epidemiological model is considered and the conditions for the existence of one or two limit cycles at least are obtained.
MSC:
92D30 Epidemiology
34C05 Topological structure of integral curves, singular points, limit cycles of ordinary differential equations
34C60 Qualitative investigation and simulation of ordinary differential equation models
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