Kinshuk Chee-Kit Looi Erkki Sutinen Demetrios G. Sampson Ignacio Aedo Lorna Uden Esko Kähkönen Proceedings of the IEEE International Conference on Advanced Learning Technologies, ICALT 2004, 30 August - 1 September 2004, Joensuu, Finland ICALT IEEE Computer Society 0-7695-2181-9 2004 db/conf/icalt/icalt2004.html