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Common Position Changes of Collocated VLBI and GPS Stations

Yavor CHAPANOV, Mila ATANASOVA, Bulgaria SUMMARY The modern geodetic observations, based on high-accuracy space techniques, provide decadal time series of station coordinates. These time series...

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The French Approach to Modernize Its Vertical Reference

Françoise DUQUENNE, Alain COULOMB et François L'ECU, France SUMMARY IGN (French Geographical Institute or Institut national de l’information gÃ...

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