What are you looking for when you say "state of the art," mathematical approaches?
Mathematical would be good. I'm just trying to find a way into the literature: it's always much faster to ask people than try to work out what is and isn't valuable from Google.
There is the odd reference of use in this lecture series and besides, the general topics are of interest if you're thinking about ET style stuff.
OTOH, if it's for something academic, maybe not so much.
