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Knight, J.P.: Resource discovery on the Internet (1996)
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Moghaddam, A.I.; Parirokh, M.: ¬A comparative study on overlapping of search results in metasearch engines and their common underlying search engines (2006)
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Web search service features (2002)
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Berinstein, P.: Images in your future : the missing picture in an online search (1997)
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