@misc{indiciae1bca0f732534,
  title = {FUNDAMENTAL GROUPS ON A LORENTZ MANIFOLD.},
  author = {J W Smith},
  year = {1960},
  doi = {10.1073/pnas.46.1.111},
  url = {https://pubmed.ncbi.nlm.nih.gov/16590583/},
  note = {Source identifier: 16590583}
}