Institution: | 1. Main (Pulkovo) Astronomical Observatory, Russian Academy of Sciences, St. Petersburg, Russia 2. St. Petersburg State University, St. Petersburg, Russia 3. Crimean Astrophysical Observatory, Nauchnyi, Russia 4. P. K. Shternberg Institute of Astronomy, M. V. Lomonosov Moscow State University, Moscow, Russia 5. Institute of Astronomy, Slovak Academy of Sciences, Tatranska Lomnica, Slovakia
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