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Periodic solution for a predator-prey system with distributed delay. (English) Zbl 1102.34056
Here, the two-dimensional system with distributed delay
$\dot{u}=\gamma u\Big(1-\frac{u}{K}\Big)- \frac{m}{y}\Big(\frac{vu}{a+u}\Big),\quad \dot{v}=v\bigg[m\Big(g^*\Big(\frac{u}{a+u}\Big)\Big)-d\bigg]\tag{1}$ is considered, where the parameters $$\gamma,K, m,y,a$$ and $$d$$ are positive constants, and
$g^*\Big(\frac{u}{a+u}\Big)(t)=\int_{-\infty}^t g(t-s)\frac{u(s)}{a+u(s)}\,ds,\quad t\,g(t)\in L^1((0,\infty);\mathbb R).$ Existence and stability of a periodic solution of system (1) are obtained.

##### MSC:
 34K13 Periodic solutions to functional-differential equations
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