Beyond sparsity: Recovering structured representations by l1{\ell}^1 minimization and greedy algorithms.

Rémi Gribonval Morten Nielsen Beyond sparsity: Recovering structured representations by l1{\ell}^1 minimization and greedy algorithms. 23-41 2008 28 Adv. Comput. Math. 1 http://dx.doi.org/10.1007/s10444-005-9009-5 db/journals/adcm/adcm28.html#GribonvalN08