@misc{indiciae470b398c0fbd,
  title = {Frequency stability requirements for space communications and tracking systems.},
  author = {Caldwell, J. J. and Rose, B. E. and Sydnor, R.},
  year = {1966},
  url = {https://ntrs.nasa.gov/citations/19660044841},
  note = {Source identifier: 19660044841}
}