@article{learningtransformationsforclusteringand,
  title = {Learning Transformations for Clustering and Classification},
  author = {Qiang Qiu and Guillermo Sapiro},
  year = {2013},
  eprint = {1309.2074},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1309.2074v2},
}