Gaia data release 2: The celestial reference frame (Gaia-CRF2) - Mignard, François; Bastian, Ulrich; Biermann, Michael; Gracia-Abril, Gonzalo; Jordan, Stefan; Löffler, Wolfgang; Hauser, Marcus; Hofmann, Wilfried; Lenhardt, Helmut; Mantelet, Grégory; Sagristà Sellés, Antoni; Altmann, Martin; et al. (Astronomy and astrophysics, 2018)
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