TY  - BOOK
AU  - Agarwal, Ravi P
AU  - O'Regan, Donal
TI  - Introduction to ordinary differential equations (an)
SN  - 9788132206736
U1  - 517.91 
PY  - 2008///
CY  - New York
PB  - Springer
KW  - DIFFERNTIAL EQUATION
KW  - OSCILLATORY PRINCIPLE
ER  -