Oscillation of first order linear retarded equations
Oscillations of linear integro-differential equations
Sufficient conditions which guarantee that certain linear integro-differential equation cannot have a positive solution are established.
Some notes to existence and stability of the positive periodic solutions for a delayed nonlinear differential equations
The paper deals with the existence of positive ω-periodic solutions for a class of nonlinear delay differential equations. For example, such equations represent the model for the survival of red blood cells in an animal. The sufficient conditions for the exponential stability of positive ω-periodic solution are also considered.
Oscillatory properties of nonlinear differential systems with retarded arguments
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