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Published online by Cambridge University Press: 21 October 2010
The Joint Discussion on the variability of fundamental constants within the IAU GA 2009 was organized with the coordination of the IAU Division VIII Galaxies & the Universe and the support of IAU Commissions N. 47 Cosmology, N. 52 Relativity in Fundamental Astronomy, N.40 Radio Astronomy and N. 30 Radial velocities. The JD provided a timely opportunity to confront different points of view on this rather exciting subject.