@misc{indiciaef75a1f0a2911,
  title = {Frequency, phase, and amplitude changes of the hydrogen maser oscillation},
  author = {Audoin, Claude and Diener, William A.},
  year = {1992},
  url = {https://ntrs.nasa.gov/citations/19920074401},
  note = {Source identifier: 19920074401}
}