PACS numbers

06.20.fb Standards and calibration
  1. D.N. Klyshko, A.N. Penin “The prospects of quantum photometry30 716–723 (1987)
    07.60.Dq, 06.20.fb, 85.60.Gz, 85.60.Ha (all)
  2. N.G. Basov, V.S. Letokhov “Optical frequency standards11 855–880 (1969)
    06.30.Ft, 06.20.fb (all)
  3. N.G. Basov, O.N. Krokhin et alPossible investigation of relativistic effects with the aid of molecular and atomic frequency standards4 641–673 (1962)
    06.20.fb, 06.30.Ft, 03.30.+p, 04.20.−q (all)
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