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Modern Astrometry [E-Book] /
Subject (ZB): “...Observations, Astronomical....”

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Astrométrie moderne [E-Book] /
Subject (ZB): “...Observations, Astronomical....”

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Reference Frames [E-Book] : In Astronomy and Geophysics /
Table of Contents: “... -- Ch. 15 - General principles of the measure of time: astronomical time -- Ch. 16 - Atomic time -- Ch. 17 - Time systems in general relativity -- 6 – Standards -- Ch. 18 - Standards for terrestrial and celestial reference systems -- B. Kolaczek: Appendix...”

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