@article{JMLR:v7:spratling06a,
  author  = {Michael W. Spratling},
  title   = {Learning Image Components for Object Recognition},
  journal = {Journal of Machine Learning Research},
  year    = {2006},
  volume  = {7},
  number  = {28},
  pages   = {793--815},
  url     = {http://jmlr.org/papers/v7/spratling06a.html}
}