Affiliation: | 1. Astronomical institute, Academy of Sciences, Ond?ejov, Czech Republic 2. NTIS - New Technologies for the Information Society, Faculty of Applied Sciences, University of West Bohemia, Pilsen, Czech Republic 3. Department of Theoretical Geodesy, Faculty of Civil Engineering, Slovak University of Technology, Radlinskho 11, Bratislava, 813 68, Slovakia
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