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In: VLDB Journal

Publisher: Very Large Data Bases Endowment Inc.
All articles published in this journal are protected by copyright, which covers the exclusive rights to reproduce and distribute the article (e.g., as offprints), as well as all translation rights. No material published in this journal may be reproduced photographically or stored on microfilm, in electronic data bases, video disks, etc., without first obtaining written permission from Very Large Data Bases Endowment Inc.

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