TY  - BOOK
AU  - Ziemer,R.E.
TI  - Communications: systems, modulation and noise 
SN  - 0395206030
AV  - TK5101 .Z57 1976
U1  - 621.3981 
PY  - 1976///
CY  - Boston
PB  - Houghton Mifflin
KW  - Principles of communication
ER  -