@incollection{NIPS2009_0865,
 title = {Group Sparse Coding},
 author = {Samy Bengio and Fernando Pereira and Yoram Singer and Dennis Strelow},
 booktitle = {Advances in Neural Information Processing Systems 22},
 editor = {Y. Bengio and D. Schuurmans and J. Lafferty and C. K. I. Williams and A. Culotta},
 pages = {82--89},
 year = {2009}
}