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Discrete Dynamics in Nature and Society
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Discrete Dynamics in Nature and Society
/
2015
/
Article
/
Fig 2
/
Research Article
An SIRS Epidemic Model with Vital Dynamics and a Ratio-Dependent Saturation Incidence Rate
Figure 2
Topological structure of system (
15
) at
and
when
, where
,
,
,
,
, and
.
