@misc{indiciae1f984f843112,
  title = {Wormhole solution to the strong CP problem.},
  author = {K Choi and R Holman},
  year = {1989},
  doi = {10.1103/physrevlett.62.2575},
  url = {https://pubmed.ncbi.nlm.nih.gov/10040026/},
  note = {Source identifier: 10040026}
}