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Estimate the internal accuracy of the VLBI catalogs
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Systematics and accuracy of VLBI astrometry
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Comparison of the multi-frequency position of extra-galactic sources
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Niu Liu / Timing-CRF vs Gaia-CRF and VLBI-CRF
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Niu Liu / icrf-axis-stability
MIT LicenseEstimate the axis stability of the ICRF3 catalog
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