TY  - BOOK
AU  -  Agarwal, Ravi P. ; Grace, Said R. ; O'Regan, Donal
TI  - Oscillation theory for difference and functional differential equations
SN  - 0792362896
U1  - 515.625 
PY  - 2000///
CY  - Netherland
PB  - Kluwer academic publishers
ER  -