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Sherman, C.; Price, G.: ¬The invisible Web : uncovering sources search engines can't see (2004)
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Lewandowski, D.; Mayr, P.: Exploring the academic invisible Web (2006)
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Egger-Sider, F.; Devine, J.: Google, the Invisible Web, and librarians : slaying the research goliath (2005)
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Charisius, H.: Gängige Suchmaschinen übersehen weite Bereiche des Internet, neue Dienste helfen beim Heben der Info-Schätze : Mehr drin, als man denkt (2003)
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