TY  - BOOK
ED  - European Space Agency
TI  - Hipparcos and Tycho catalogues: vol. 4, construction of Tycho catalogue
T2  - SP-1200
SN  - 92-9092-399-7
PY  - 1997///
CY  - Netherlands
PB  - European Space Agency
KW  - Catalogue-Hipparcos and Tycho, Star catalogue
ER  -