@incollection{NIPS2009_0978,
 title = {On Invariance in Hierarchical Models},
 author = {Jake Bouvrie and Lorenzo Rosasco and Tomaso  Poggio},
 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 = {162--170},
 year = {2009}
}