Jeff Rickel Stacy Marsella Jonathan Gratch Randall Hill David R. Traum William R. Swartout Toward a New Generation of Virtual Humans for Interactive Experiences. 32-38 2002 17 IEEE Intelligent Systems 4 http://doi.ieeecomputersociety.org/10.1109/MIS.2002.1024750 db/journals/expert/expert17.html#RickelMGHTS02