IIRC, that one was a decent overview, though he has worked on similar issues in older papers: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.99.133 htt

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