@article{implicitlyconstrainedsemisupervisedlinea,
  title = {Implicitly Constrained Semi-Supervised Linear Discriminant Analysis},
  author = {Jesse H. Krijthe and Marco Loog},
  year = {2014},
  eprint = {1411.4521},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1411.4521v1},
}