Elber, G., Shaked, O. & Shmueli, O., 21 Mar 2002, IPC No. G06T 17/ 00 A I, Patent No. US2002033839, Priority date 25 Jun 2001, Priority No. US20010887026
Elber, G., Gertelman, M., Shaked, O. & Shmueli, O., 21 Mar 2002, IPC No. G06T 17/ 00 A I, Patent No. US2002033845, Priority date 25 Jun 2001, Priority No. US20010887040