TY  - BOOK
AU  - Vrema, Pramode K.
TI  - ISDN systems: architecture,technology, and applications 
SN  - 0135057361
AV  - TK5103.7  .I84 1990
PY  - 1990///
CY  - New JErsey
PB  - Prentice-Hall
KW  - Integrated services digital networks
ER  -