@article{772111,
  author = {Scott Diddams and James Bergquist and Steven Jefferts and Christopher Oates},
  title = {Standards of time and frequency at the outset of the 21st century},
  year = {2004},
  number = {306},
  month = {2004-11-19 00:11:00},
  publisher = {Science},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50063},
  language = {en},
}