Christian Eckes Konstantin Biatov Frank Hülsken Joachim Köhler Pia Breuer Pedro Branco L. Miguel Encarnação Towards Sociable Virtual Humans: Multimodal Recognition of Human Input and Behavior. 21-30 2007 6 IJVR 4 http://www.ijvr.org/issues/issue4-2007/3.pdf db/journals/ijvr/ijvr6.html#EckesBHKBBE07