References
SSL VPN security white paper at http://www.cisco.com, Steven Song, http://www.cisco.com/web/about/security/intelligence/05_08_SSL-VPN-Security.html.
Cisco SAFE VPN IPSec Virtual Private Networks in Depth, Jason Halpern, et al., http://www.cisco.com/en/US/netsol/ns340/ns394/ns171/ns128/networking_solutions_white_paper09186a00801dca2d.shtml#wp48088.
Networkers 2006 presentation SEC-2010, Deploying Remote Access IPSec and SSL VPNs, Pete Davis.