@misc{indiciaece59b6051963,
  title = {A fully automated calibration method for an optical see-through head-mounted operating microscope with variable zoom and focus.},
  author = {Michael Figl and Christopher Ede and Johann Hummel and Felix Wanschitz and Rolf Ewers and Helmar Bergmann and Wolfgang Birkfellner},
  year = {2005},
  doi = {10.1109/tmi.2005.856746},
  url = {https://pubmed.ncbi.nlm.nih.gov/16279085/},
  note = {Source identifier: 16279085}
}