@article{theroleofprincipalanglesinsubspace,
  title = {The Role of Principal Angles in Subspace Classification},
  author = {Jiaji Huang and Qiang Qiu and Robert Calderbank},
  year = {2015},
  eprint = {1507.04230},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1507.04230v1},
}