<a href="http:&#x2F;&#x2F;www.lugod.org&#x2F;presentations&#x2F;virt-lugod.pdf" rel="nofollow">http:&#x2F;&#x2F;www.lugod.org&#x2F;presentations&#x2F;virt-lugod.pdf</a>
and
<a href="http:&#x2F;&#x2F;taviso.decsystem.org&#x2F;virtsec.pdf" rel="nofollow">http:&#x2F;&#x2F;taviso.decsystem.org&#x2F;virtsec.pdf</a><p>These seem to be the most popular ones that show up.