ProbonoWorld: Educating the Mentally Handicapped in a Virtual Environment using Props on a Board. - Saskia Groenewegen; Bernd Froehlich 001; Anke Huckauf; Stefanie Heinz (Eurographics (Education Papers), 2007)

Virtual world interfaces for special needs education based on props on a board. - Saskia Groenewegen; Stefanie Heinz; Bernd Fröhlich 001; Anke Huckauf (Comput. Graph., 2008)