@misc{1150761,
  author = {Petrina C. Potts},
  title = {NIST Time and Frequency Bulletin:},
  year = {2013},
  month = {2013-02-01 05:02:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NIST.IR.1149-02},
  language = {en},
}