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Pfeifer, U.; Poersch, T.; Fuhr, N.: Retrieval effectiveness of proper name search methods (1996)
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Pfeifer, U.; Pennekamp, S.: Incremental processing of vague queries in interactive retrieval systems (1997)
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Pfeifer, U.: Entwicklung linear-iterativer und logistischer Indexierungsfunktionen (1991)
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