@misc{W1974928788,
  author = {Wolfgang Dür and Guifré Vidal and J. I. Cirac},
  title = {Three qubits can be entangled in two inequivalent ways},
  year = {2000},
  howpublished = {Physical Review A},
  doi = {https://doi.org/10.1103/physreva.62.062314}
}