@article{JMLR:v18:16-119,
  author  = {Siqi Wu and Bin Yu},
  title   = {Local Identifiability of $\ell_1$-minimization Dictionary Learning: a Sufficient and Almost Necessary Condition},
  journal = {Journal of Machine Learning Research},
  year    = {2018},
  volume  = {18},
  number  = {168},
  pages   = {1--56},
  url     = {http://jmlr.org/papers/v18/16-119.html}
}