TY  - BOOK
AU  - Proakis, G. John 
TI  - Digital communication 
SN  - 0-07-118183-0 
U1  - 621.382 PRO  
PY  - 2001///
CY  - Tata Mcgraw hill 
PB  - Boston 
KW  - COMMUNICATION SYSTEM
ER  -