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Richard M. Martin Department of Physics, University of Illinois, 1110 W. Green St., Urbana, IL 61801, U.S.A. email: rmartin@uiuc.edu Michael W. Finnis Atomistic Simulation Group, School of Mathematics & Physics, Queen's University Belfast, BT7 1NN United Kingdom email: m.finnis@qub.ac.uk Stefano Baroni SISSA and DEMOCRITOS, Via Beirut 2-4, 34014 Trieste, Italy email: baroni@democritos.it |