@misc{indiciae19c8d20e9126,
  title = {Letter: Ultrasonic cephalometry.},
  author = {S Campbell},
  year = {1974},
  doi = {10.1016/s0140-6736(74)93072-4},
  url = {https://pubmed.ncbi.nlm.nih.gov/4128862/},
  note = {Source identifier: 4128862}
}