@article{JMLR:v15:mizutani14a,
  author  = {Tomohiko Mizutani},
  title   = {Ellipsoidal Rounding for Nonnegative Matrix Factorization Under Noisy Separability},
  journal = {Journal of Machine Learning Research},
  year    = {2014},
  volume  = {15},
  number  = {29},
  pages   = {1011--1039},
  url     = {http://jmlr.org/papers/v15/mizutani14a.html}
}