1. Andronikou V, Yannopoulos A, Varvarigou T (2008) Biometric profiling: opportunities and risks. In: Hildebrandt M, Gutwirth S (eds) Profiling the European citizen cross-disciplinary perspectives. Springer, Berlin
2. Busso C, Deng Z, Yildirim S, Bulut M, Lee CM, Kazemzadeh A, Lee S, Neumann U, Narayanan S (2004) Analysis of emotion recognition using facial expressions, speech and multimodal information. In: Proceedings of ACM 6th international conference on multimodal interfaces (ICMI 2004), State College, PA
3. Caridakis G, Castellano G, Kessous L, Raouzaiou A, Malatesta L, Asteriadis S, Karpouzis K (2007) Multimodal emotion recognition from expressive faces, body gestures and speech. In: Boukis C, Pnevmatikakis A, Polymenakos L (eds) Artificial intelligence and innovations 2007: from theory to applications. Springer, Berlin
4. Chung HB (2010) Information privacy: a key challenge of information society. Available at: http://www.apiicc.org/apiicc/Lecture/IT_HRD/10.pdf . Accessed 19 Apr 2010
5. Ekman P, Friesen WV (1971) Constants across cultures in the face and emotion. J Personal Soc Psychol 17(2):124–129