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Brommer, Karl; Needels, M.; Larson, B.; Joannopoulos, J. Ab initio theory of the Si(111)-(7×7) surface reconstruction: A challenge for massively parallel computation. Phys. Rev. Lett. 1992, 68 (9): 1355–1359. Bibcode:1992PhRvL..68.1355B. doi:10.1103/PhysRevLett.68.1355.