@article{nestednonnegativeconeanalysis,
  title = {Nested Nonnegative Cone Analysis},
  author = {Lingsong Zhang and J. S. Marron and Shu Lu},
  year = {2013},
  eprint = {1308.4206},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1308.4206v2},
}