@misc{1200371,
  author = {Kathryn Stephenson},
  title = {NIST time and frequency bulletin: december:},
  year = {2017},
  month = {2017-12-01 05:12:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NIST.IR.8167-12},
  language = {en},
}