@inproceedings {LeeS00_AlgorithmsNmf_NIPS,
  author     = {Daniel D. Lee and H. Sebastian Seung},
  title      = {Algorithms for Non-negative Matrix Factorization},
  booktitle  = {Proceedings of the Neural Information Processing Systems ({NIPS})},
  address    = {Denver, CO, USA},
  year       = {2000},
  pages      = {556--562}
}