@book{ BA72972034, author = "European Space Agency and Perryman, M. A. C.", title = "Ad astra HIPPARCOS : the European Space Agency's Astrometry Mission : an introduction compiled on behalf of the ESA Hipparcos Project Team by M. A. C. Perryman", publisher = "European Space Agency", year = "1985", URL = "https://ci.nii.ac.jp/ncid/BA72972034" }