@article{JMLR:v14:rosasco13a,
  author  = {Lorenzo Rosasco and Silvia Villa and Sofia Mosci and Matteo Santoro and Alessandro Verri},
  title   = {Nonparametric Sparsity and Regularization},
  journal = {Journal of Machine Learning Research},
  year    = {2013},
  volume  = {14},
  number  = {52},
  pages   = {1665--1714},
  url     = {http://jmlr.org/papers/v14/rosasco13a.html}
}