@misc{indiciaeeefbd54ec478,
  title = {Four recurring themes.},
  author = {K R Porter},
  year = {1973},
  doi = {10.1136/bmj.1.5844.40},
  url = {https://pubmed.ncbi.nlm.nih.gov/4345908/},
  note = {Source identifier: 4345908}
}