TY  - BOOK
AU  - Nussbaumer,Henri J.,1931-
TI  - Computer communication systems Vol.1 : Data circutis, error detection and data links
SN  - 0471924954
U1  - TK/5105.5 
PY  - 1990///
CY  - Chichester
PB  - John Wiley & Sons
KW  - Computer networks.
ER  -