@incollection{LeeEtAlNIPS06:EfficientSparseCoding,
 title = {Efficient sparse coding algorithms},
 author = {Honglak Lee and Alexis Battle and Rajat Raina and Andrew Y. Ng},
 booktitle = {Advances in Neural Information Processing Systems 19},
 editor = {B. Sch\"{o}lkopf and J. Platt and T. Hoffman},
 publisher = {MIT Press},
 address = {Cambridge, MA},
 year = {2007}
}