@conference{179491,
  author = {Thomas Parker},
  title = {A Comparison of Cs Fountain Primary Frequency Standards},
  year = {2008},
  month = {2008-04-23},
  publisher = {Proc. EFTF Conf., Toulouse, FR},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=842462},
  language = {en},
}