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Dresel, R.; Hörnig, D.; Kaluza, H.; Peter, A.; Roßmann, A.; Sieber, W.: Evaluation deutscher Web-Suchwerkzeuge : Ein vergleichender Retrievaltest (2001)
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Krüger, K.: Suchmaschinen-Spamming : Vergleichend-kritische Analysen zur Wirkung kommerzieller Strategien der Website-Optimierung auf das Ranking in www-Suchmaschinen (2004)
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Stock, W.G.: Verkaufte Suchwörter, verkaufte Links : Retrieval nach Homepages optimiert? (1999)
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Lehmann, K.; Machill, M.; Sander-Beuermann, W.: Blackbox Suchmaschine : Politik für Neue Medien. Interview mit Marcel Machill und Wolfgang Sander-Beuermann (2005)
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Dees, W.: "Publication power approach" (2013)
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