@misc{indiciae0b38ce7d0353,
  title = {PhD theses.},
  author = {L B Halstead},
  year = {1971},
  doi = {10.1038/229579a0},
  url = {https://pubmed.ncbi.nlm.nih.gov/16059363/},
  note = {Source identifier: 16059363}
}