@misc{1200536,
  author = {Petrina C Potts},
  title = {NIST Time and Frequency Bulletin:},
  year = {2015},
  month = {2015-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NIST.IR.8044-01},
  language = {en},
}