@article{JMLR:v16:qiu15a,
  author  = {Qiang Qiu and Guillermo Sapiro},
  title   = {Learning Transformations for Clustering and Classification},
  journal = {Journal of Machine Learning Research},
  year    = {2015},
  volume  = {16},
  number  = {7},
  pages   = {187--225},
  url     = {http://jmlr.org/papers/v16/qiu15a.html}
}