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On Preservation under Homomorphisms and Unions of Conjunctive Queries Albert Atserias Universitat Polit`ecnica de Catalunya, Dept. LSI Jordi Girona SalgadoBarcelona, Spain
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Document Date: 2006-03-03 18:11:44
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On Preservation under Homomorphisms and Unions of Conjunctive Queries Albert Atserias Universitat Polit`ecnica de Catalunya, Dept. LSI Jordi Girona SalgadoBarcelona, Spain