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Robust aggregation-based coarsening for additive Schwarz in the case of highly variable coefficientsScheichl, R. (author), Vainikko, E. (author)We study two-level overlapping domain decomposition preconditioners with coarse spaces obtained by smoothed aggregation in iterative solvers for finite element discretisations of second-order elliptic problems. We are particularly interested in the situation where the diffusion coefficient (or the permeability) is highly variable throughout the...conference paper 2006