1. Theory of Functionai Differential Equations;Hale,1977
2. Oscillation Theory for Functional Differential Equations;Erbe,1995
3. Oscillation Theory of Delay Differential Equations with Applications;Györi,1991
4. Delay Differential Equations with Applications in Population Dynamics;Kuang,1993
5. Linear Differential Equations with Delaed Argument;Myshkis,1972