@misc{indiciae4bd3c97f738c,
  title = {Strong CP problem and parity.},
  author = {SM Barr and D Chang and G Senjanovic},
  year = {1991},
  doi = {10.1103/physrevlett.67.2765},
  url = {https://pubmed.ncbi.nlm.nih.gov/10044549/},
  note = {Source identifier: 10044549}
}