I am looking to read a good rigorous book about cybernetics. I've read some things but they seemed somewhat basic. Are there any good rigorous textbooks on it?
EDIT: basically, I am interested in understanding things like "the good regulator theorem", and things like it (hopefully there are more results in roughly that direction?); also interested in the relation between this and information theory. I am not so interested in "let's apply this to understand the real world of robotics/biology/etc", though its fine if references are made to this as long as the rest of the text is mathematically rigorous.
Disclaimer: I don't consider myself to be any expert in cybernetics and most of the links and articles mentioned below have been taken from a Google search.
This link gives a list of references used for the course "Introduction to Systems Science" at SUNY Binghamton.
Here is a sample of books recommended by members of the cybernetics society as useful introduction to the science of Cybernetics. Quite a comprehensive list of books are mentioned.
This is quite an old article introducing cybernetics and information theory. See also here.
A recent article (compared with the two mentioned above) would be found here. Also, a very good exposition can be found here.
Hope these resources help you.