TY  - BOOK
AU  - Bellamy 
TI  - Digital telephony 
T2  - Wiley series in telecommunication
SN  - 0471620564 
U1  - 621.385 BEL 1990 
PY  - 1990///
CY  - New York
PB  - John Wiley & Sons
KW  - Digital telephone systems
N1  - Includes bibliographical references and index
ER  -