1. Caltech frontal face dataset.
http://www.vision.caltech.edu/archive.html
2. The color FERET database.
http://www.nist.gov/itl/iad/ig/colorferet.cfm
3. Lecture Notes in Computer Science;T Ahonen,2004
4. Azeem, A., Sharif, M., Raza, M., Murtaza, M.: A survey: face recognition techniques under partial occlusion. Int. Arab J. Inf. Technol. 11(1), 1–10 (2014)
5. Bay, H., Tuytelaars, T., Gool, L.V.: SURF: speeded up robust features. In: European Conference on Computer Vision, pp. 404–417 (2006)