@misc{1200591,
  author = {Petrina C. Potts},
  title = {NIST Time and Frequency Bulletin:},
  year = {2014},
  month = {2014-04-01 04:04:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NIST.IR.7980-04},
  language = {en},
}