TY  - BOOK
AU  - Welch, Samuel
TI  - SIGNALLING IN TELECOMMUNICATIONS NETWORKS
U1  - 621.3851 
PY  - 1979///
CY  - Stevanage
PB  - Peter Peregrinus
KW  - Signal Theory (Telcommunications)
KW  - Telephone Systems
KW  - Electric Networks
ER  -