@article{JMLR:v11:mairal10a,
  author  = {Julien Mairal and Francis Bach and Jean Ponce and Guillermo Sapiro},
  title   = {Online Learning for Matrix Factorization and Sparse Coding},
  journal = {Journal of Machine Learning Research},
  year    = {2010},
  volume  = {11},
  number  = {2},
  pages   = {19--60},
  url     = {http://jmlr.org/papers/v11/mairal10a.html}
}