Ricardo Azambuja Silveira Adriane Borda Almeida da Silva Demetrio Arturo Ovalle Carranza Antônio Carlos da Rocha Costa Heloisa Vieira da Rocha Marcelo Payssé Mary Lou Maher Monica Fernandez Neusa Felix Rosa Maria Vicari Workshop on Distance Learning Environments for Digital Graphic Representation. 911 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3220&spage=911 2004 conf/its/2004 Intelligent Tutoring Systems db/conf/its/its2004.html#SilveiraSCCRPMFFV04