Tereza G. Kirner Claudio Kirner André Luiz Satoshi Kawamoto Jefferson Cantão Aloísio Pinto Raul Sidnei Wazlawick Development of a collaborative virtual environment for educational applications. 61-68 2001 Web3D http://doi.acm.org/10.1145/363361.363378 db/conf/vrml/vrml2001.html#KirnerKKCPW01