TY  - BOOK
AU  - Verma,Pramode K.
TI  - ISDN systems: architecture, technologyand applications 
SN  - 0135057361
U1  - 004.6 
PY  - 1990///
CY  - New Jersey
PB  - Prentice-Hall
KW  - Integrated services digital networks
N1  - Includes bibliographical references and index
ER  -