Algorithms for simultaneous sparse approximation. part I: greedy pursuit. Tropp, J.; Gilbert, A.; and Strauss, M. Signal Processing, special issue ``Sparse approximations in signal and image processing'', 86:572-588, April 2006.
bibtex   
@Article{Tropp_April2006_10829,
  author = {Tropp, J. and Gilbert, A. and Strauss, M.},
 journal = {Signal Processing, special issue ``Sparse approximations in signal and image processing''},
 pages = {572-588},
 title = {{Algorithms for simultaneous sparse approximation. part I: greedy pursuit}},
 volume = {86},
 year = {April 2006},
 title_with_no_special_chars = {Algorithms for simultaneous sparse approximation Part I Greedy pursuit}
}
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