@book{ BA3493747X, author = "European Space Agency and Perryman, M. A. C.", title = "Introduction and guide to the data", publisher = "European Space Agency", year = "1997", series = "The Hipparcos and Tycho catalogues : astrometric and photometric star catalogues derived from the ESA Hipparcos Space Astrometry Mission", number = "v. 1", URL = "https://ci.nii.ac.jp/ncid/BA3493747X" }