@misc{indiciae9533b29f9b21,
  title = {Mercury Atomic Frequency Standards for Space Based Navigation and Timekeeping},
  author = {Tjoelker, R. L. and Burt, E. A. and Chung, S. and Hamell, R. L. and Prestage, J. D. and Tucker, B. and Cash, P. and Lutwak, R.},
  year = {2012},
  url = {https://ntrs.nasa.gov/citations/20130001864},
  note = {Source identifier: 20130001864}
}