@misc{indiciaefdff57c1bc32,
  title = {Letter: Ultrasonic cephalometry.},
  author = {S Campbell},
  year = {1973},
  doi = {10.1016/s0140-6736(73)90954-9},
  url = {https://pubmed.ncbi.nlm.nih.gov/4128029/},
  note = {Source identifier: 4128029}
}