@article{JMLR:v14:bahmani13a,
  author  = {Sohail Bahmani and Bhiksha Raj and Petros T. Boufounos},
  title   = {Greedy Sparsity-Constrained Optimization},
  journal = {Journal of Machine Learning Research},
  year    = {2013},
  volume  = {14},
  number  = {25},
  pages   = {807--841},
  url     = {http://jmlr.org/papers/v14/bahmani13a.html}
}