Gamasutra: Read my lips - Facial Animation Techniques.
http://www.gamasutra.com/features/20000406/lander_01.htm
Gamasutra: Flex your facial muscles.
http://www.gamasutra.com/features/20000414/lander_01.htm

Books:

Digital Character Animation – George Maestri.
Maya 2 Character Animation – Coleman, Sheridan and Vogel.
Animating Facial Features and Expressions – Fleming, Dobbs.

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