IIRC, that one was a decent overview, though he has worked on similar issues in older papers: <a href="http:&#x2F;&#x2F;citeseerx.ist.psu.edu&#x2F;viewdoc&#x2F;summary?doi=10.1.1.99.133" rel="nofollow">http:&#x2F;&#x2F;citeseerx.ist.psu.edu&#x2F;viewdoc&#x2F;summary?doi=10.1.1.99.1...</a><p>It has been a while since I read those papers, there may better references.