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  1. Bertelmann, R.; Rusch-Feja, D.: Informationsretrieval im Internet : Surfen, Browsen, Suchen - mit einem Überblick über strukturierte Informationsangebote (1997) 10.27
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    Bertelmann, R.
  2. Bertelmann, R.; Braune, S.: ¬Ein Mapserver zur Suche im Kartenbestand (2003) 10.27
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  3. Bertelmann, R.; Höhnow, T.; Volz, S.: Bibliothekssuchmaschine statt Bibliothekskatalog (2007) 10.27
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    Bertelmann, R.