Hideki Koike Yoichi Sato Yoshinori Kobayashi Integrating paper and digital information on EnhancedDesk: a method for realtime finger tracking on an augmented desk system. 307-322 2001 8 ACM Trans. Comput.-Hum. Interact. 4 http://doi.acm.org/10.1145/504704.504706 db/journals/tochi/tochi8.html#KoikeSK01