@misc{indiciae3b08382fc303,
  title = {Compact Microwave Mercury Ion Clock for Space Applications},
  author = {Prestage, John D. and Tu, Meirong and Chung, Sang K. and MacNeal, Paul},
  year = {2008},
  url = {https://ntrs.nasa.gov/citations/20150008616},
  note = {Source identifier: 20150008616}
}