@misc{indiciaed03d97f5f02e,
  title = {Hydrogen-Maser/Ruby-Maser/Quartz-Crystal Oscillator},
  author = {Wang, Rabi T. and Dick, G. John},
  year = {1994},
  url = {https://ntrs.nasa.gov/citations/19940000101},
  note = {Source identifier: 19940000101}
}