@misc{indiciae2affc349831a,
  title = {Trifocals, fitting possibilities and problems.},
  author = {H BERENHOLTZ},
  year = {1950},
  doi = {10.1097/00006324-195012000-00002},
  url = {https://pubmed.ncbi.nlm.nih.gov/14785917/},
  note = {Source identifier: 14785917}
}