Eva Hudlicka To feel or not to feel: The role of affect in human-computer interaction. 1-32 2003 59 Int. J. Hum.-Comput. Stud. 1-2 http://dx.doi.org/10.1016/S1071-5819(03)00047-8 db/journals/ijmms/ijmms59.html#Hudlicka03