TY  - BOOK
AU  - Black, Uyless D.
TI  - Data communications and distributed networks
SN  - 8120309251
U1  - 004.6 
PY  - 1993/// (2004)
CY  - New Delhi
PB  - Prentice Hall of India
KW  - Data transmission systems
KW  - Computer networks
ER  -