TY  - BOOK
AU  - Mairs,John
TI  - VPNs: a beginner's guide 
T2  - Network professional's library
SN  - 0072191813
AV  - TK5105.875. E87  .M34 2002
PY  - 2002///
CY  - New York
PB  - McGraw-Hill/Osborne
KW  - Extranets (Computer networks)
ER  -