@misc{indiciaed9d7435f0e40,
  title = {Integrated GPS, range-range and hyperbolic LORAN C marine navigation system for use on IBM AT or compatible microcomputer},
  author = {John T. Gann},
  year = {1988},
  doi = {10.3133/ofr88562},
  url = {https://pubs.usgs.gov/publication/ofr88562},
  note = {Source identifier: ofr88562}
}