@article{JMLR:v7:ye06a,
  author  = {Jieping Ye and Tao Xiong},
  title   = {Computational and Theoretical Analysis of  Null Space  and Orthogonal Linear Discriminant Analysis},
  journal = {Journal of Machine Learning Research},
  year    = {2006},
  volume  = {7},
  number  = {43},
  pages   = {1183--1204},
  url     = {http://jmlr.org/papers/v7/ye06a.html}
}