@article{articleaf1b7454, title = {Gaia Data Release 2 - The celestial reference frame (Gaia-CRF2)}, author = {Mignard, F and Klioner, S. A and Lindegren, L and Hernandez, J and Bastian, U and Souza, Ronaldo Eustáquio de and Teixeira, Ramachrisna}, year = {2018}, doi = {10.1051/0004-6361/201832916}, journal = {Astronomy & Astrophysics} }