TY  - GEN
AU  - Halsall, Fred
AU  - Halsall, Fred
TI  - Data communications, computer networks and open systems
SN  - 9788178080987
U1  - 004.7 HAL 
PY  - 2000///
CY  - New Delhi
PB  - Addison-Wesley
KW  - Data comunications
KW  - computer networks
ER  -