@inproceedings{algorithmsfornonnegativematrix,
  title = {Algorithms for Non-negative Matrix Factorization},
  author = {Daniel D. Lee and H. Sebastian Seung},
  year = {2000},
  booktitle = {NeurIPS 2000 12},
  url = {http://papers.nips.cc/paper/1861-algorithms-for-non-negative-matrix-factorization},
}