@misc{indiciae7a2eb562dcdd,
  title = {Hydrogen maser frequency standards for the Deep Space Network},
  author = {Dachel, P. R. and Petty, S. M. and Meyer, R. F. and Sydnor, R. L.},
  year = {1977},
  url = {https://ntrs.nasa.gov/citations/19770024251},
  note = {Source identifier: 19770024251}
}