this paper niiiiice
http://dx.doi.org/10.1145/1390156.1390250
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Only have IEEE access these days :-(
Probably a bit beyond me anyway!
oh yah, alternate:
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.149.6285&rep=rep1&type=pdf
is easy to read if ignoring maths