An investigation into the reproducibility of some points, planes, and lines used in cephalometric analysis.

@article{Richardson1966AnII,
  title={An investigation into the reproducibility of some points, planes, and lines used in cephalometric analysis.},
  author={Andrew E Richardson},
  journal={American journal of orthodontics},
  year={1966},
  volume={52 9},
  pages={637-51}
}