Ingo Bax Holger Bekel Gunther Heidemann Recognition of Gestural Object Reference with Auditory Feedback. 425-432 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2714&spage=425 2003 conf/icann/2003 ICANN db/conf/icann/icann2003.html#BaxBH03