Double sparsity: learning sparse dictionaries for sparse signal approximation. Rubinstein, R., M. Zibulevsky, undefined, & Elad, M. IEEE Transactions on Signal Processing, 58(3):1553-1564, 2010.
bibtex   
@Article{Rubinstein_2010_11060,
  author = {Rubinstein, R. and M. Zibulevsky, and Elad, M.},
 journal = {IEEE Transactions on Signal Processing},
 number = {3},
 pages = {1553-1564},
 title = {Double sparsity: learning sparse dictionaries for sparse signal approximation},
 volume = {58},
 year = {2010},
 title_with_no_special_chars = {Double Sparsity Learning Sparse Dictionaries for Sparse Signal Approximation}
}

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