1. Aarts, E.: Ambient Intelligence – Visualizing the Future. In: Proc. Conf. Smart Objects & Ambient Intelligence (2005), http://www.soc-eusai2005.org/
2. Ambady, N., Rosenthal, R.: Thin Slices of Expressive Behavior as Predictors of Interpersonal Consequences: A Meta-Analysis. Psychological Bulletin 111(2), 256–274 (1992)
3. Anderson, K., McOwan, P.W.: A Real-Time Automated System for Recognition of Human Facial Expressions. IEEE Trans. Systems, Man, and Cybernetics, Part B 36(1), 96–105 (2006)
4. Aristotle: Physiognomonica. In: Ross, W.D. (ed.) The works of Aristotle, pp. 805–813. Clarendon, Oxford (1913)
5. Baker, S., Matthews, I., Xiao, J., Gross, R., Kanade, T.: Real-time non-rigid driver head tracking for driver mental state estimation. In: Proc. World Congress on Intelligent Transportation Systems (2004), http://www.ri.cmu.edu/projects/project_448.html