TY  - BOOK
AU  - Singh,R.P.
AU  - Sapre,S.D.
TI  - Communication systems: analog and digital 
SN  - 0070634541 :
PY  - 2007///
CY  - New Delhi
PB  - Tata McGraw-Hill
KW  - Telecommunication systems
KW  - Digital communications
ER  -