@misc{indiciae98af348b30de,
  title = {Reference charts for controlled extraoral force application to maxillary molars.},
  author = {R A Greenspan},
  year = {1970},
  doi = {10.1016/0002-9416(70)90025-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/5273636/},
  note = {Source identifier: 5273636}
}