@misc{indiciaea71ca5a5845c,
  title = {A full 3D-navigation system in a suitcase.},
  author = {W Freysinger and M J Truppe and A R Gunkel and W F Thumfart},
  year = {2001},
  doi = {10.1002/igs.1012},
  url = {https://pubmed.ncbi.nlm.nih.gov/11568984/},
  note = {Source identifier: 11568984}
}