TY  - BOOK
AU  - Oppenheim, Alan W...et.al.
AU  - Willsky, Alan S.
AU  - Nawab, S Hamid. 
TI  - Signals and systems
SN  - 9788120312463
U1  - 621.3822320 22
PY  - 2007///
CY  - New Delhi, 
PB  - Prentices Hall, 
ER  -