Wielen, R. (1990). A comprehensive astrometric data base: An instrument for combining earth-bound observations with HIPPARCOS data. Inertial coordinate system on the sky.
Chicago-Zitierstil (17. Ausg.)Wielen, Roland. "A Comprehensive Astrometric Data Base: An Instrument for Combining Earth-bound Observations with HIPPARCOS Data." Inertial Coordinate System on the Sky 1990.
MLA-Zitierstil (9. Ausg.)Wielen, Roland. "A Comprehensive Astrometric Data Base: An Instrument for Combining Earth-bound Observations with HIPPARCOS Data." Inertial Coordinate System on the Sky, 1990.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.