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Feldman, S.: "Just the answer, please" : choosing a Web search service (1997)
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Chu, H.; Rosenthal, M.: Search engines for the World Wide Web : a comparative study and evaluation methodology (1996)
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Sherman, C.: Reference resources on the Web (2000)
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Heidenreich, F.: Know your search engine : a comparison of 6 popular Web search engines (1997)
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DeZelar-Tiedman, C.: Known-item searching on the World Wide Web (1997)
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