@article{MariKielingNielsenetal.2011,
  author    = {Andrea Mari and Konrad Kieling and B. Melholt Nielsen and E. S. Polzik and Jens Eisert},
  title     = {Directly estimating nonclassicality},
  journal   = {Physical review letters},
  volume    = {106},
  number    = {1},
  doi       = {10.1103/PhysRevLett.106.010403},
  year      = {2011},
}