Applications: There are two particularly important books in this area:

Lea, Doug (1999) Concurrent Programming in Java, Addison Wesley , Boston, MA.
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Goetz, Brian (2006) Java Concurrency in Practice, Addison Wesley , Boston, MA.
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Foundations: An excellent textbook on the foundations of concurrent programming is:

Herlihy, Maurice and Nir Shavit (2008) The Art of Multiprocessor Programming, Morgan Kaufmann , Boston, MA.
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WWW Pages: There are some WWW pages devoted to these issues, including: