TY  - BOOK
AU  - Frenzel Louis E. 
TI  - Principles of electronic communication systems
SN  - 13:978-0-07-066755-6 
U1  - 621.382 
PY  - 2010///
CY  - New delhi
PB  -  Tata Mcgraw Hill 
KW  - Engineering
ER  -