Yasuhiro Watanabe Koichi Nishimura Saori Sugiyama Norihiro Abe Kazuaki Tanaka Hirokazu Taki Tetsuya Yagi Man and Machine Bidirectional Communication Interface Using Voice and Pointing Action. 622-633 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3207&spage=622 2004 conf/euc/2004 EUC db/conf/euc/euc2004.html#WatanabeNSATTY04