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William W. Durgin, P. Roussel, D. H. Matthiesen, 1993 .

High-Accuracy Global Time and Frequency Transfer with a Space-Borne Hydrogen Maser Clock

David W. Allan, R. Decher, Carroll O. Alley, 1982 .

Test of relativistic gravitation with a space-borne hydrogen maser

R. Decher, C. R. Baugher, T. E. Hoffman, 1980 .

A Comparison of Low-Gravity Measurements On-Board Columbia During STS-40

William W. Durgin, D. H. Matthiesen, R. C. Blanchard, 1993 .