PACS numbers

95.55.Sh Auxiliary and recording instruments; clocks and frequency standards
  1. A.A. Belyaev, V.G. Voronzov et alN G Basov's legacy: from the first masers to optical frequency standards66 1026–1036 (2023)
    06.20.−f, 84.40.lk, 95.55.Sh (all)
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