TY  - BOOK
AU  - Verma, Pramode K.,
AU  - Saltzberg, Burton R.
TI  - Isdn systems: Architecture, technology, and applications 
SN  - 0-13-505736-1
AV  - TK5103.7 I73
PY  - 1990///
CY  - Englewood cliffs, new jersey
PB  - Prentice Hall
KW  - Redes digitales de servicios integrados
ER  -