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db/journals/dpd/LiuP97.html Ling Liu Calton Pu An Adaptive Object-Oriented Approach to Integration and Access of Heterogeneous Information Sources. 167-205 1997 DPD/5/P167.pdf 5 Distributed and Parallel Databases 2 db/journals/dpd/dpd5.html#LiuP97 http://kapis.www.wkap.nl/oasis.htm/131868