1. [1] I. Buciu and I. Pitas, Subspace Image Representation for Facial Expression Analysis and Face Recognition and Its Relation to the Human Visual System, Organic Computing, pp.303-320, Springer Verlag, 2008.
2. [2] M.S. Barlett, G. Littlewort, M. Frank, and C. Lainscsek, “Recognizing facial expression: Machine learning and application to spontaneous behavior,” International Conference on Computer Vision and Pattern Recognition (CVPR), pp.568-573, 2005.
3. [3] R. Duda, P. Hart, and D. Stork, Pattern Classification, 2nd ed. John Wiley & Sons, 2001.
4. [4] J. Ho, M. Yang, J. Lim, K. Lee, and D. Kriegman, “Clustering appearances of objects under varying illumination conditions,” Proc. IEEE International Conference on Computer Vision and Pattern Recognition, pp.11-18, 2001.
5. [5] A.Y. Yang, J. Wright, Y. Ma, and S. Sastry, “Feature selection in face recognition: A sparse representation perspective,” UC Berkeley Tech Report UCB/EECS-2007-99, 2007.