@misc{indiciaef3489fdb6ee7,
  title = {A frameless stereotaxic operating microscope for neurosurgery.},
  author = {E M Friets and J W Strohbehn and J F Hatch and D W Roberts},
  year = {1989},
  doi = {10.1109/10.29455},
  url = {https://pubmed.ncbi.nlm.nih.gov/2659493/},
  note = {Source identifier: 2659493}
}