@misc{indiciae111d0c02cd8a,
  title = {Positive P representation.},
  author = {R Schack and A Schenzle},
  year = {1991},
  doi = {10.1103/physreva.44.682},
  url = {https://pubmed.ncbi.nlm.nih.gov/9905718/},
  note = {Source identifier: 9905718}
}