@article{JMLR:v9:loog08a,
  author  = {Marco Loog},
  title   = {On the Equivalence of Linear Dimensionality-Reducing Transformations},
  journal = {Journal of Machine Learning Research},
  year    = {2008},
  volume  = {9},
  number  = {82},
  pages   = {2489--2490},
  url     = {http://jmlr.org/papers/v9/loog08a.html}
}