Emmanuelle Richard Angèle Tijou Paul Richard Multi-modal Virtual Environments for Education: From Illusion to Immersion. 1274-1279 2006 conf/edutainment/2006 Edutainment http://dx.doi.org/10.1007/11736639_158 db/conf/edutainment/edutainment2006.html#RichardTR06