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Atomic and Astronomical TimeESSEN, L.; PARRY, J. V. L. · 1956
Frequency of Cesium in Terms of Ephemeris TimeMarkowitz, W.; Hall, R. Glenn; Essen, L.; Parry, J. V. L. · Physical Review Letters · 1958
Comparison of C;æsium Frequency Standards of Different ConstructionPARRY, J. V. L.; HOLLOWAY, J. H.; MAINBERGER, W. A.; REDER, F. H.; WINKLER, G. M. R.; ESSEN, L. · 1958
The Caesium Resonator as a Standard of Frequency and TimeEssen, L.; Parry, J. V. L. · Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences · 1957
An Atomic Standard of Frequency and Time Interval: A Cæsium ResonatorESSEN, L.; PARRY, J. V. L. · 1955