@article{JMLR:v8:loog07a,
  author  = {Marco Loog},
  title   = {A Complete Characterization of a Family of Solutions to a Generalized Fisher Criterion},
  journal = {Journal of Machine Learning Research},
  year    = {2007},
  volume  = {8},
  number  = {72},
  pages   = {2121--2123},
  url     = {http://jmlr.org/papers/v8/loog07a.html}
}