Henk W. Broer, M. Cristina Ciocci, Heinz Hanßmann The quasi-periodic reversible Hopf bifurcation (2227K, PostScript) ABSTRACT. We consider reversible systems near a quasi-periodic invariant torus that is in a normal-internal 1:1 resonance. Aim is to describe the dynamics of a generic unfolding model. It turns out that a quasi-periodic reversible Hopf bifurcation is involved. Using KAM theory, we describe how the resulting invariant tori of maximal and lower dimensions are parametrised by Cantor sets.