References:

Papers about CNNs and facial recognition:

• http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=554195 (also has good overview of other techniques)
• http://www-labs.iro.umontreal.ca/~pift6080/H09/documents/papers/sparse/matsugo_etal_face_expression_conv_nnet.pdf

Dataset: https://www.kaggle.com/c/challenges-in-representation-learning-facial-expression-recognition-challenge/data

TensorFlow: http://tensorflow.org/