@Inproceedings{Lee_1996_8837,
  author = {Lee, D.D. and Seung, H.S.},
booktitle = {Proc. {NIPS}},
 pages = {515-521},
 title = {Unsupervised learning by convex and conic coding},
 year = {1996},
 title_with_no_special_chars = {Unsupervised Learning by Convex and Conic Coding}
}