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Poetzsch, E.: Information Retrieval : Einführung in Grundlagen und Methoden (1998)
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Poetzsch, E.: Information Retrieval : Einführung in Grundlagen und Methoden (2001)
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Poetzsch, E.: Information Retrieval : Einführung in Grundlagen und Methoden (2005)
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Poetzsch, E.: Information Retrieval : Einführung in Grundlagen und Methoden (2006)
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