Variability of extragalactic sources: its contribution to the link between ICRF and the future Gaia Celestial Reference FrameF. Taris, G. Damljanovic, A. Andrei, J. Souchay, A. Klotz and F. VachierA&A, 611 (2018) A52DOI: https://doi.org/10.1051/0004-6361/201731362
