Salvador Barrera Piperakis Romanos Suguru Saito Hiroki Takahashi Masayuki Nakajima Real Time Detection Interface For Walking on CAVE. 105-111 2003 conf/cgi/2003 Computer Graphics International http://csdl.computer.org/comp/proceedings/cgi/2003/1946/00/19460105abs.htm db/conf/cgi/cgi2003.html#BarreraRSTN03