@misc{indiciaea64437aa626a,
  title = {Historical Glimpses. The X Factor.},
  author = {R Williams},
  year = {1998},
  doi = {10.1111/j.1747-4477.1998.tb00023.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/11431822/},
  note = {Source identifier: 11431822}
}