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    EDBT
    2004
    ACM
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    Processing Unions of Conjunctive Queries with Negation under Limited Access Patterns
    15 years 16 days ago
    Processing Unions of Conjunctive Queries with Negation under Limited Access Patterns
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    We study the problem of answering queries over sources with limited access patterns. The problem is to decide whether a given query Q is feasible, i.e., equivalent to an executable...
    Alan Nash, Bertram Ludäscher
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