TY  - BOOK
AU  - Kessler, G
TI  - Isdn:concepts,fcilities:and services
SN  - 0-07-114430-7
U1  - 004.6 
PY  - 1996///
CY  - New Delhi
PB  - Mcgraw-Hill Publication
KW  - Computer EngineeringInformation Technology
ER  -