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How classifications work : problems and challenges in an electronic age (1998)
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Feldman, S.: Testing natural language : comparing DIALOG, TARGET, and DR-LINK (1996)
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Khoo, C.S.G.; Wan, K.-W.: ¬A simple relevancy-ranking strategy for an interface to Boolean OPACs (2004)
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Evans, R.: Beyond Boolean : relevance ranking, natural language and the new search paradigm (1994)
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Frei, H.P.; Meienberg, S.: Evaluating weighted search terms as Boolean queries (1991)
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