David Oyarzun Maider Lehr Amalia Ortiz Maria del Puy Carretero Alejandro Ugarte Karmelo Vivanco Alejandro García-Alonso Using Virtual Characters as TV Presenters. 225-236 2007 conf/edutainment/2007 Edutainment http://dx.doi.org/10.1007/978-3-540-73011-8_24 db/conf/edutainment/edutainment2007.html#OyarzunLOCUVG07