@misc{indiciae252bd00c0fca,
  title = {Atomic frequency standards for ultra-high-frequency stability},
  author = {Maleki, L. and Prestage, J. D. and Dick, G. J.},
  year = {1987},
  url = {https://ntrs.nasa.gov/citations/19880003303},
  note = {Source identifier: 19880003303}
}