This page is an informal list of references in no particular order that I have
found useful or that others have pointed out to me. If you have a suggested
reference that is not listed here then please mail it to me and I will add it
to the list.
There is a huge number of informative web pages out there and by their very
nature they change quickly. I will attempt to keep the links below as valid as
possible but they may become outdated.
