Carlos Delgado-Mata Jesús Ibáñez-Martínez Simon Bee Rocio Ruiz-Rodarte Ruth Aylett On the Use of Virtual Animals with Artificial Fear in Virtual Environments. 145-169 2007 25 New Generation Comput. 2 http://dx.doi.org/10.1007/s00354-007-0009-5 db/journals/ngc/ngc25.html#Delgado-MataIBRA07