I recall some paper from people who had already implemented it.<p>Edit: It might have been this one: <a href="http:&#x2F;&#x2F;research.microsoft.com&#x2F;apps&#x2F;pubs&#x2F;?id=224900" rel="nofollow">http:&#x2F;&#x2F;research.microsoft.com&#x2F;apps&#x2F;pubs&#x2F;?id=224900</a>