@misc{1200351,
  author = {Kathryn Stephenson},
  title = {NIST time and frequency bulletin - May:},
  year = {2018},
  month = {2018-05-01 04:05:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NIST.IR.8205-05},
  language = {en},
}