@misc{indiciae9ee502986e74,
  title = {A phantom head for teaching dental radiography.},
  author = {R E Clarke and N J Smith},
  year = {1970},
  doi = {10.1016/0030-4220(70)90163-5},
  url = {https://pubmed.ncbi.nlm.nih.gov/4195513/},
  note = {Source identifier: 4195513}
}