TY  - BOOK
AU  - Coover, Edwin R.
TI  - Tutorial : Digital Private Branch Exchanges 
SN  - 0818648295
U1  - 621.387 COO 
PY  - 1989///
CY  - Washington D C 
PB  - IEEE Computer Society Press
KW  - Tutorial
KW  -  and Digital Private Branch Exchange
KW  - , PBXs
KW  -  and Distributed architectures
ER  -