@misc{indiciae229c492c2616,
  title = {Short-term stability of passive atomic frequency standards},
  author = {R. F. Lacey and A. L. Helgesson and J. H. Holloway},
  year = {1965},
  url = {https://ntrs.nasa.gov/citations/19660001105},
  note = {Source identifier: 19660001105}
}