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Pfeifer, U.; Fuhr, N.; Huynh, T.: Searching structured documents with the enhanced retrieval functionality of freeWAIS-sf and SFgate (1995)
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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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Pfeifer, U.: Searching structured documents with the enhanced retrieval functionality of freeWAIS-sf and SFgate (1996)
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