@misc{indiciaeed785986b851,
  title = {Extra Dimensions and the strong CP problem.},
  author = {M Chaichian and A B Kobakhidze},
  year = {2001},
  doi = {10.1103/physrevlett.87.171601},
  url = {https://pubmed.ncbi.nlm.nih.gov/11690261/},
  note = {Source identifier: 11690261}
}