TY  - BOOK
AU  - Joel,Amos E.
TI  - Electronic switching : digital central office systems of the world
SN  - 0879421592
U1  - TK/6397 
PY  - 1982///
CY  - New York
PB  - IEEE Press
KW  - Telephone switching systems, Electronic -- Addresses, essays, lectures.
ER  -