@conference{799241,
  author = {Thomas Heavner and Tom Parker and Jon Shirley and Steven Jefferts},
  title = {NIST F1 and F2},
  year = {2008},
  month = {2008-10-05 00:10:00},
  publisher = {Proc. 2008 Symposium on Frequency Standards and Metrology, Pacific Grove, CA, US},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=901130},
  language = {en},
}