@misc{indiciaee04e42d1a7e0,
  title = {Graphing indexes reduces plaque.},
  author = {R W Barrickman and O J Penhall},
  year = {1973},
  doi = {10.14219/jada.archive.1973.0616},
  url = {https://pubmed.ncbi.nlm.nih.gov/4518563/},
  note = {Source identifier: 4518563}
}