C. Ulbricht, D. Schmalstieg:
"Tangible Augmented Reality for Computer Games";
in: "Proceedings of the Third IASTED International Conference on Visualization, Imaging and Image Processing", issued by: ACTA Press; ACTA Press, 2003, ISBN: 0889863822, 950 - 954.
http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC04404548