@conference{63341,
  author = {Steven Jefferts and D Meekhof and Jon Shirley and Thomas Parker},
  title = {Preliminary Accuracy Evaluation of a Cesium Fountain Primary Frequency Standard at NIST},
  year = {1999},
  month = {1999-01-01},
  publisher = {13^uth^ European Frequency and Time Forum and 1999 IEEE Int. Freq. Symp. , Besan{c-cedilla}on, FR},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=105321},
  language = {en},
}