@misc{indiciae71bcce888648,
  title = {Gravity field error analysis - Applications of Global Positioning System receivers and gradiometers on low orbiting platforms},
  author = {Schrama, Ernst J. O.},
  year = {1991},
  url = {https://ntrs.nasa.gov/citations/19920032049},
  note = {Source identifier: 19920032049}
}