The Measurement of Frequency and Time Interval.
By L. Essen. Pp. v+55. (National Physical Laboratory: Teddington, December, 1973.) £1.
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SADLER, D. Atomic time. Nature 249, 90 (1974). https://doi.org/10.1038/249090b0
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DOI: https://doi.org/10.1038/249090b0