Gaia data release 2: Observational Hertzsprung-Russell diagrams - Babusiaux, Carine; Biermann, Michael; Bastian, Ulrich; Gracia-Abril, Gonzalo; Altmann, Martin; Jordan, Stefan; Löffler, Wolfgang; Brüsemeister, Thomas; Hauser, Marcus; Hofmann, Wilfried; Lenhardt, Helmut; Mantelet, Grégory; et al. (Astronomy and astrophysics, 2018)
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