@inproceedings{oninvarianceinhierarchicalmodels,
  title = {On Invariance in Hierarchical Models},
  author = {Jake Bouvrie and Lorenzo Rosasco and Tomaso Poggio},
  year = {2009},
  booktitle = {NeurIPS 2009 12},
  url = {http://papers.nips.cc/paper/3732-on-invariance-in-hierarchical-models},
}