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3. Frischholz, R.: Bao face database at the face detection homepage.
http://www.facedetection.com
(last accessed September 26, 2014)
4. Stump-based 20x20 gentle adaboost frontal face detector, Created by Rainer Lienhart.
https://github.com/Itseez/opencv/blob/master/data/haarcascades/haarcascade_frontalface_alt.xml
(last accessed September 23, 2014)
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