TY  - BOOK
AU  - Mairs,John
TI  - VPNs: a beginner's guide 
SN  - 0070498954 (pbk) :
U1  - 005.262 
PY  - 2002///
CY  - New Delhi
PB  - McGraw-Hill
KW  - Extranets (Computer networks)
N1  - Includes index
ER  -