@misc{indiciae5e264288c8a6,
  title = {B-mode orbital ultrasonography.},
  author = {E W Purnell},
  year = {1969},
  doi = {10.1097/00004397-196900930-00008},
  url = {https://pubmed.ncbi.nlm.nih.gov/5396776/},
  note = {Source identifier: 5396776}
}