@misc{indiciae8210d6d222d6,
  title = {A Periodontitis Severity Index.},
  author = {R A Adams and G P Nystrom},
  year = {1986},
  doi = {10.1902/jop.1986.57.3.176},
  url = {https://pubmed.ncbi.nlm.nih.gov/3457141/},
  note = {Source identifier: 3457141}
}