Amalia Ortiz David Oyarzun Maria del Puy Carretero ELEIN: E-Learning with 3D Interactive Emotional Agents. 294-305 2009 Edutainment http://dx.doi.org/10.1007/978-3-642-03364-3_38 conf/edutainment/2009 db/conf/edutainment/edutainment2009.html#OrtizOC09