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Raeder, A.: Cataloguing the Web (1995)
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Kimmel, S.: Robot-generated databases on the World Wide Web (1996)
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Fife, E.D.; Husch, L.: ¬The Mathematics Archives : making mathematics easy to find on the Web (1999)
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Brandt, D.S.: What flavor is your Internet search engine? (1997)
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Thelwall, M.: Quantitative comparisons of search engine results (2008)
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