TY  - BOOK
AU  - Singh, R. P. Sapre, S.D. 
TI  - Communication systems 
SN  - 0-07-063454-8 
U1  - 621.382 SIN  
PY  - 2007///
CY  - Tata mcgraw hill company Ltd 
PB  - New Delhi 
KW  - COMMUNICATION SYSTEM
ER  -