TY  - BOOK
AU  - Zill, Dennis G
AU  - Cullen, Michael R.
TI  - Differential equations with boundary-value problems
U1  - 515.35 
PY  - 2007///
CY  - Islamabad
PB  - National Book Foundation
KW  - Boundery value problems
N1  - Includes bibliographical references and index
ER  -