@misc{indiciaef597239ed0d4,
  title = {Esthetic feasibility study using a labial index.},
  author = {H A Williams and D L Koth},
  year = {1982},
  doi = {10.1016/0022-3913(82)90134-2},
  url = {https://pubmed.ncbi.nlm.nih.gov/7047725/},
  note = {Source identifier: 7047725}
}