1. Non Linear Functional Analysis;Deimling,1985
2. Phase space for retarded equations with infinite delay;Hale;Funkcial. Ekvac.,1978
3. Periodic solutions of quasi-linear partial functional differential equations with unbounded delay;Henriquez;Funkcial. Ekvac.,1994
4. E. Hernandez, H. R. Henriquez, Existence results for partial neutral functional differential equations with unbounded delay, J. Math. Anal. Appl.
5. Functional Differential Equations with Infinite Delay;Hino,1991