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A. Löser, C. Tempich, B. Quilitz, S. Staab, W. Balke, and W. Nejdl. The Semantic Web – ISWC 2005: 4th International Semantic Web Conference, ISWC 2005, volume 3729 of LNCS, page 491 -- 505. Galway, Ireland, Springer-Verlag GmbH, (November 2005)