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<referencetext xmlns="http://eprints.org/ep2/data/2.0">Lewandowski, Dirk: "Find what I mean not what I say": neuere Ansätze zur Qualifizierung von Suchmaschinen-Ergebnissen. In: BuB 53(2001)6/7, S. 381-386

Lawrence, Steve/Giles, C. Lee: Accessibility of information on the web. Nature 400(1998)8, S. 108

Sherman, Chris und Gary Price: The Invisible Web: uncovering information sources search engines can't see. Medford, 2001.</referencetext>
