@inproceedings{sparsedeepbeliefnetmodelforvisualarea,
  title = {Sparse deep belief net model for visual area V2},
  author = {Honglak Lee and Chaitanya Ekanadham and Andrew Y. Ng},
  year = {2007},
  booktitle = {NeurIPS 2007 12},
  url = {http://papers.nips.cc/paper/3313-sparse-deep-belief-net-model-for-visual-area-v2},
}