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Renato Carmo, Tomás Feder, Yoshiharu Kohayakawa, Eduardo Sany Laber, Rajeev Motwani, Liadan O Callaghan, Rina Panigrahy, Dilys Thomas. Querying priced information in databases: The conjunctive case. ACM Transactions on Algorithms, 3(1), 2007. [doi]