TY  - BOOK
AU  - Oppenheim, Alan V; Willsky, Alan S & Nawab, S Hamid
TI  - Signals & systems .-2nd ed .-978-81-203-1246-3
SN  - 978-81-203-1246-3
U1  - 621.38043 Opp 
PY  - 2012///
CY  - Phi Learning, New Delhi
ER  -