@article{nonparametricunsupervisedclassification,
  title = {Nonparametric Unsupervised Classification},
  author = {Yingzhen Yang and Thomas S. Huang},
  year = {2012},
  eprint = {1210.0645},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1210.0645v5},
}