Stephen N. Spencer Dieter W. Fellner Johannes Behr Krzysztof Walczak Proceeding of the 14th International Conference on 3D Web Technology, Web3D 2009, Darmstadt, Germany, June 16-17, 2009 Web3D ACM 2009 db/conf/vrml/web3d2009.html 978-1-60558-432-4