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Großjohann, K.: Gathering-, Harvesting-, Suchmaschinen (1996)
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Vidmar, D.J.: Darwin on the Web : the evolution of search tools (1999)
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Dunning, A.: Do we still need search engines? (1999)
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Birmingham, J.: Internet search engines (1996)
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Hock, R.E.: How to do field searching in Web search engines : a field trip (1998)
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Conhaim, W.W.: Search tools (1996)
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Duval, B.K.; Main, L.: Searching on the Net : general overview (1996)
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Hsieh-Yee, I.: ¬The retrieval power of selected search engines : how well do they address general reference questions and subject questions? (1998)
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Chang, C.-H.; Hsu, C.-C.: Customizable multi-engine search tool with clustering (1997)
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