@misc{indiciae677a53d27cf2,
  title = {Cryo-cooled sapphire oscillator operating above 35K},
  author = {Wang, R. T. and Dick, G. J.},
  year = {2000},
  url = {https://ntrs.nasa.gov/citations/20060040475},
  note = {Source identifier: 20060040475}
}