@inproceedings{afamilyofpenaltyfunctionsforstructured,
  title = {A Family of Penalty Functions for Structured Sparsity},
  author = {Jean Morales and Charles A. Micchelli and Massimiliano Pontil},
  year = {2010},
  booktitle = {NeurIPS 2010 12},
  url = {http://papers.nips.cc/paper/4137-a-family-of-penalty-functions-for-structured-sparsity},
}