Zoraida Callejas Ramón López-Cózar Decisive Factors in the Annotation of Emotions for Spoken Dialogue Systems. 747-754 2008 Computer Recognition Systems 2 http://dx.doi.org/10.1007/978-3-540-75175-5_92 series/asc/2008-45 db/series/asc/asc45.html#CallejasL08