@misc{1196651,
  author = {Roger E Beehler and Roger E Beehler and Michael A Lombardi},
  title = {NIST time and frequency services:},
  year = {1991},
  month = {1991-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NIST.SP.432e1991},
  language = {en},
}