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Rijsbergen, K. van: ¬The geometry of information retrieval (2004)
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Reiner, U.: Anfragesprachen für Informationssysteme (1991)
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Schaarschmidt, R.: Archivierung in Datenbanksystemen : Konzept und Sprache (2001)
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Towards the Semantic Web : ontology-driven knowledge management (2004)
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Gugerli, D.: Suchmaschinen : die Welt als Datenbank (2009)
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