@misc{indiciae684b0e0101a7,
  title = {Evaluation of modern hydrogen masers},
  author = {Kirk, A. and Kuhnle, P. and Sydnor, R. L.},
  year = {1983},
  url = {https://ntrs.nasa.gov/citations/19830027097},
  note = {Source identifier: 19830027097}
}