The independent components of natural scenes are edge filters. Bell, A. & Sejnowski, T. Vision Research, 37:3327, 1997.
bibtex   
@Article{Bell_1997_8854,
  author = {Bell, A.J. and Sejnowski, T.J.},
 journal = {Vision Research},
 pages = {3327},
 title = {The independent components of natural scenes are edge filters},
 volume = {37},
 year = {1997},
 title_with_no_special_chars = {The Independent components of natural scenes are edge filters}
}

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