1. Ordinary and delay differential equations;Driver,1977
2. Functional Differential Equations;Hale,1971
3. Lee J. W. & O'Regan D., Existence results for differential delay equations I, J. diff. Eqns (to appear).
4. Nonlinear boundary value problems for some classes of ordinary differential equations;Granas;Rocky Mountain J. math.,1980
5. Existence results for initial and boundary value problems;O'Farrell;Proc. Am. math. Soc.,1990