http://uwspace.uwaterloo.ca/bitstream/10012/3867/1/thesis.pdf http://uwspace.uwaterloo.ca/bitstream/10012/3867/1/thesis.pd... is one of the best general paper

http://uwspace.uwaterloo.ca/bitstream/10012/3867/1/thesis.pdf http://uwspace.uwaterloo.ca/bitstream/10012/3867/1/thesis.pd... is one of the best general papers I've read on the subject.