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**Oscillatority conditions for nonlinear systems with delay.**
*(English)*
Zbl 1151.34054

The authors propose sufficient conditions of oscillatority in the sense of Yakubovich for nonlinear systems with time delay. By using a circadian oscillations model and a blood cells production model as illustrative examples, they showe that the amplitude bounds obtained from analytical calculations agree with those from computer simulations.

Reviewer: Kwok-wai Chung (Kowloon, Hong Kong)

### MSC:

34K13 | Periodic solutions to functional-differential equations |

34K11 | Oscillation theory of functional-differential equations |

93C23 | Control/observation systems governed by functional-differential equations |

### References:

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