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Periodic solutions in a delayed predator-prey models with nonmonotonic functional response
| 1. | School of Mathematic and Statistics, Lanzhou University, Lanzhou, Gansu 730000, China |
| 2. | School of Mathematics and Information Sciences, Ludong University, Yantai, Shandong 264025, China |
$y^{'}(t)=y(t)[ \frac{\mu (t)x(t-\tau )}{m^2+x^2(t-\tau )} -d(t)]. \]$ is established, where $a(t), b(t), \mu (t)$ and $d(t)$ are all positive periodic continuous functions with period $\omega >0$, $m>0$ and $\tau \geq 0 $ are constants.
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