Hiroyuki Mitsuhara Yasumoto Hirakawa Kazuhide Kanenishi Yoneo Yano Real World Edutainment Focusing on Human-Human Interaction. 527-538 2007 conf/edutainment/2007 Edutainment http://dx.doi.org/10.1007/978-3-540-73011-8_51 db/conf/edutainment/edutainment2007.html#MitsuharaHKY07