@misc{indiciaefc287ae2dbef,
  title = {Sub-meter GPS orbit determination and high precision user positioning - A demonstration},
  author = {Lichten, Stephen M. and Bertiger, Willy I. and Katsigris, Eugenia C.},
  year = {1988},
  url = {https://ntrs.nasa.gov/citations/19880063127},
  note = {Source identifier: 19880063127}
}