Making Discours Visible: Coding and Animating Conversational Facial Displays. - Douglas DeCarlo; Corey Revilla; Matthew Stone; Jennifer J. Venditti (CA, 2002)

Specifying and animating facial signals for discourse in embodied conversational agents. - Douglas DeCarlo; Matthew Stone; Corey Revilla; Jennifer J. Venditti (Comput. Animat. Virtual Worlds, 2004)