Affiliation: | 1. Institute of Radio Astronomy, Kharkov, Ukraine 2. Catholic University of Leuven, Leuven, Belgium 5. Observatoire de Paris, Meudon, France 3. Royal Observatory of Belgium, Brussels, Belgium 4. Institute of Geophysics, Gravimetrical Observatory, Poltava, Ukraine 6. Space Research Institute, Graz, Austria
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