@article{JMLR:v10:abernethy09a,
  author  = {Jacob Abernethy and Francis Bach and Theodoros Evgeniou and Jean-Philippe Vert},
  title   = {A New Approach to Collaborative Filtering: Operator Estimation with Spectral Regularization},
  journal = {Journal of Machine Learning Research},
  year    = {2009},
  volume  = {10},
  number  = {29},
  pages   = {803--826},
  url     = {http://jmlr.org/papers/v10/abernethy09a.html}
}