@misc{indiciaea5ea9c96995e,
  title = {Evaluation of some software measuring displacements using GPS in real-time},
  author = {John O. Langbein},
  year = {2006},
  doi = {10.3133/ofr20061235},
  url = {https://pubs.usgs.gov/publication/ofr20061235},
  note = {Source identifier: ofr20061235}
}