@misc{indiciae0b586504b611,
  title = {Experimental human gingivitis.},
  author = {L A Friedman and J M Klinkhamer},
  year = {1971},
  doi = {10.1902/jop.1971.42.11.702},
  url = {https://pubmed.ncbi.nlm.nih.gov/4942412/},
  note = {Source identifier: 4942412}
}