TY  - BOOK
AU  - Held,Gilbert
TI  - Data communications networking devices : characteristics, operation, applications
SN  - 0471918695
U1  - TK/5105.5 
PY  - 1989///
CY  - New York
PB  - John Wiley & Sons
KW  - Computer networks.
KW  - Data transmission systems.
ER  -