Osvaldo Gervasi Donald P. Brutzman Proceeding of the Twelfth International Conference on 3D Web Technology, Web3D 2007, Perugia, Italy, April 15-18, 2007 Web3D ACM 2007 https://doi.org/10.1145/1229390 db/conf/vrml/web3d2007.html 978-1-59593-652-3