@conference{825601,
  author = {L Nelson and Judah Levine and P Hetzel},
  title = {Comparing Primary Frequency Standards at NIST and PTB},
  year = {2000},
  month = {2000-01-01 00:01:00},
  publisher = {2000 IEEE Intl. Freq. Cont. Symp. , Kansas City, MO, USA},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=105491},
  language = {en},
}