@conference{123051,
  author = {Robert Drullinger and Jon Shirley and HoSeong Lee},
  title = {Preliminary Investigations with the NIST Optically Pumped Primary Frequency Standard},
  year = {1991},
  month = {1991-01-01},
  publisher = {5^uth^ European Frequency and Time Forum , Besan{c-cedilla}on, FR},
  language = {en},
}