@article{179991,
  author = {Thomas Parker and Steven Jefferts and Thomas Heavner and Elizabeth Donley},
  title = {Operation of the NIST-F1 Cesium Fountain Primary Frequency Standard with a Maser Ensemble},
  year = {2005},
  number = {42},
  month = {2005-09-13},
  publisher = {Metrologia},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=50144},
  language = {en},
}