Since this group is particularly interested in modeling and analyzing
scheduling applications with timed automata, the following two papers
might be of interest:
General context: formal methods, and more precisely,
verification/controller synthesis/test generation
for real-time systems.
Brief history:
Books: none on timed-automata in particular, many on verification
(using different models). Manna/Pnueli is classic, Alur/Henzinger
is being written, Clarke/Grunberg/McMillan are also writing one
on model-checking. Also, "Design and Validation of Computer Protocols",
by G.Holzmann (author of Spin).
Papers: many...
I suggest that you read the survey paper by Alur above.
This paper contains many interesting references.
The papers involving me as an author are available on
my web-page.