The astrometric core solution for the Gaia mission - Overview of models, algorithms, and software implementationL. Lindegren, U. Lammers, D. Hobbs, W. O’Mullane, U. Bastian and J. HernándezA&A, 538 (2012) A78DOI: https://doi.org/10.1051/0004-6361/201117905
