@misc{indiciaecb608e0913ad,
  title = {A ruler for depth measurements during stereotactic operations. A technical note.},
  author = {E O Backlund},
  year = {1993},
  doi = {10.1007/bf01405189},
  url = {https://pubmed.ncbi.nlm.nih.gov/8475814/},
  note = {Source identifier: 8475814}
}