@misc{W1571385165,
  author = {H Ollivier and Wojciech H. Zurek},
  title = {Quantum Discord: A Measure of the Quantumness of Correlations},
  year = {2001},
  howpublished = {Physical Review Letters},
  doi = {https://doi.org/10.1103/physrevlett.88.017901}
}