Motoki Miura Susumu Kunifuji Buntarou Shizuki Jiro Tanaka Augmented Classroom: A Paper-Centric Approach for Collaborative Learning System. 104-116 2004 conf/ucs/2004 UCS http://dx.doi.org/10.1007/11526858_9 db/conf/ucs/ucs2004.html#MiuraKST04