@article{UBHD-67798405,
  author={Bombrun, Alex and Jordan, Stefan},
  title={Complexity of the Gaia astrometric least-squares problem and the (non-)feasibility of a direct solution method},
  year={2010},
  pages={13 S.},
  language={eng},
  issn={1432-0746},
  volume={516(2010) Artikel-Nr. A77},
  number={13 S.},
  note={Gesehen am 02.04.2015},
  journal={Astronomy and astrophysics},
  doi={10.1051/0004-6361/200913503},
}