TY  - BOOK
AU  - Oppenheim Alan V. 
AU  - Willsky A S
TI  - Signals and systems
SN  - 978-81-203-1246-3 
U1  - 621.38223 
PY  - 2012///
CY  - New delhi
PB  -  Phi Pub. 
KW  - Engineering
ER  -