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Veenema, F.: To index or not to index (1996)
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Booth, A.: How consistent is MEDLINE indexing? (1990)
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Krovetz, R.; Croft, W.B.: Lexical ambiguity and information retrieval (1992)
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Harter, S.P.; Cheng, Y.-R.: Colinked descriptors : improving vocabulary selection for end-user searching (1996)
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Burgin, R.: ¬The effect of indexing exhaustivity on retrieval performance (1991)
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