Lutfi, Syaheerah Lebai, Fernando Fernández-Martínez, Juan Manuel Lucas-Cuesta, Lorena López-Lebón, and Juan Manuel Montero, “A Satisfaction-Based Model for Affect Recognition from Conversational Features in Spoken Dialog Systems”, Speech Communication 55, nos. 7–8 (September 2013), pp. 825–840, http://www.researchgate.net/publication/257012012_A_satisfaction-based_model_for_affect_recognition_from_conversational_features_in_spoken_dialog_systems.