TY  - BOOK
AU  - Bocker , P.
TI  - I S D N The integrated services digital network concepts  methods systems
SN  -  3-540-54819-x
U1  - 621.382 B63,i 
PY  - 1992///
CY  -  Berlin
PB  -  Springer Verlag
KW  -  Electronics Engineering
ER  -