Affiliation: | 1. Physical and Satellite Geodesy, Technische Universitaet Darmstadt, Darmstadt, Germany 2. Danish National Space Institute, Technical University of Denmark, Kgs. Lyngby, Denmark 3. Astronomical Observatory, Faculty of Science, University of Porto, Vila Nova de Gaia, Portugal 4. Department of Geosciences Environment and Spatial Planning, Faculty of Science, University of Porto, Porto, Portugal
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