Also relevant:
<a href="http:&#x2F;&#x2F;research.microsoft.com&#x2F;pubs&#x2F;170248&#x2F;fds-final.pdf" rel="nofollow">http:&#x2F;&#x2F;research.microsoft.com&#x2F;pubs&#x2F;170248&#x2F;fds-final.pdf</a>