There is so much published material available on
the web, in journals and magazines and in conference proceedings
that it is impossible for anyone to read it all. I have tried to
avoid simply including links to web sites that I have not read.
I only include links to published articles that I have read and
to web sites where I have reviewed the material as both relevant
to the book and of reasonable quality. I have mostly avoided links
to web sites that are simply Powerpoint presentations. However,
for some topics, these are the best that is currently available
and so I have included them.