Paper  bibtex   

@Webpage{Foldiak_2008_12787,
  author = {Peter Foldiak and Dominik Endres},
 month = {06},
 organization = {Scholarpedia},
 publisher = {Scholarpedia},
 title = {Sparse coding},
 year = {2008},
 url = {http://www.scholarpedia.org/article/Sparse_coding},
 title_with_no_special_chars = {Sparse Coding}
}