@misc{indiciaed645e74c2344,
  title = {Analysis of a Four-Station Doppler Tracking Method Using a Simple CW Beacon},
  author = {Fricke, Clifford L. and Watkins, Carl W. L.},
  year = {1961},
  url = {https://ntrs.nasa.gov/citations/20010103393},
  note = {Source identifier: 20010103393}
}