If you use this dataset in your research work, please cite

"Challenges in Representation Learning: A report on three machine learning
contests." I Goodfellow, D Erhan, PL Carrier, A Courville, M Mirza, B
Hamner, W Cukierski, Y Tang, DH Lee, Y Zhou, C Ramaiah, F Feng, R Li,
X Wang, D Athanasakis, J Shawe-Taylor, M Milakov, J Park, R Ionescu,
M Popescu, C Grozea, J Bergstra, J Xie, L Romaszko, B Xu, Z Chuang, and
Y. Bengio. arXiv 2013.

See fer2013.bib for a bibtex entry.