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Here you go :

1. http://docs.opencv.org/modules/objdetect/doc/cascade_classification.html?highlight=cascade%20classifier
2. http://docs.opencv.org/doc/user_guide/ug_traincascade.html?highlight=cascade%20classifier
3. http://docs.opencv.org/doc/tutorials/objdetect/cascade_classifier/cascade_classifier.html?highlight=cascade%20classifier