@misc{indiciae081b133e170c,
  title = {Semi-Major Axis Knowledge and GPS Orbit Determination},
  author = {Carpenter, J. Russell and Schiesser, Emil R. and Bauer, F.},
  year = {2000},
  url = {https://ntrs.nasa.gov/citations/20000091037},
  note = {Source identifier: 20000091037}
}