J. V. L. PARRY

Atomic and Astronomical Time

L. ESSEN, J. V. L. PARRY, L. Essen, 1956, Nature.

Comparison of C;æsium Frequency Standards of Different Construction

L. ESSEN, J. V. L. PARRY, J. H. HOLLOWAY, 1958, Nature.

An Atomic Standard of Frequency and Time Interval: A Cæsium Resonator

J. V. L. PARRY, L. Essen, J. Parry, 1955, Nature.