@article{EisertPlenio1999,
  author    = {Eisert, Jens and Plenio, M. B.},
  title     = {A comparison of entanglement measures},
  year      = {1999},
  abstract  = {We compare the entanglement of formation with a measure defined as the modulus of the negative eigenvalue of the partial transpose. In particular we investigate whether both measures give the same ordering of density perators with respect to the amount of entanglement.},
  language  = {en}
}