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Lindegren, L, Lammers, U, Bastian, U, Hernández, J, Klioner, S, Hobbs, D, Bombrun, A, Michalik, D, Ramos-Lerate, M, Butkevich, A, Comoretto, G, Joliet, E, Holl, B, Hutton, A, Parsons, P, Steidelmüller, H, Abbas, U, Altmann, M, Andrei, A, Anton, S et al, Bach, N, Barache, C, Becciani, U, Berthier, J, Bianchi, L, Biermann, M, Bouquillon, S, Bourda, G, Brüsemeister, T, Bucciarelli, B, Busonero, D, Carlucci, T, Castañeda, J, Charlot, P, Clotet, M, Crosta, M, Davidson, M, De Felice, F, Drimmel, R, Fabricius, C, Fienga, A, Figueras, F, Fraile, E, Gai, M, Garralda, N, Geyer, R, González-Vidal, JJ, Guerra, R, Hambly, NC, Hauser, M, Jordan, S, Lattanzi, MG, Lenhardt, H, Liao, S, Löffler, W, McMillan, PJ, Mignard, F, Mora, A, Morbidelli, R, Portell, J, Riva, A, Sarasso, M, Serraller, I, Siddiqui, H, Smart, R, Spagna, A, Stampa, U, Steele, IA, Taris, F, Torra, J, Van Reeven, W, Vecchiato, A, Zschocke, S, De Bruijne, J, Gracia, G, Raison, F, Lister, T, Marchant, JM, Messineo, R, Soffel, M, Osorio, J, De Torres, A and O'Mullane, W (2016) Gaia Data Release 1: Astrometry: One billion positions, two million proper motions and parallaxes. Astronomy and Astrophysics, 595 (A4). ISSN 0004-6361