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Peterson, R.E.: Eight Internet search engines compared (1996)
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Koch, T.: Suchmaschinen im Internet (1996)
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Dasgupta, S.K.: Search engines : tooles for exploring the Internet (1998)
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Hock, R.: Search engines (2009)
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Howe, A.E.; Dreilinger, D.: SavvySearch: a metasearch engine that learns with search engines to query (1997)
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