@INPROCEEDINGS{HeiChe:2015,
  author = {H. Huttunen and K. Chen and A. Thakur and A. Krohn-Grimberghe and O. Gencoglu and X. Ni and M. Al-Musawi and L. Xu and H. Jacob van Veen},
  title = {Computer Vision for Head Pose Estimation: Review of a Competition},
  booktitle = {Scandinavian Conf. on Image Analysis (SCIA2015)},
  year = {2015},
  address = {Copenhagen, Denmark},
  url = {http://vision.cs.tut.fi/data/publications/scia2015_hpe.pdf}
}