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Humphrey, S.M.: Knowledge-based systems for indexing (1994)
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Humphrey, S.M.: Use and management of classification systems for knowledge-based indexing (1992)
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Humphrey, S.M.; Névéol, A.; Browne, A.; Gobeil, J.; Ruch, P.; Darmoni, S.J.: Comparing a rule-based versus statistical system for automatic categorization of MEDLINE documents according to biomedical specialty (2009)
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Lassalle, E.: Text retrieval : from a monolingual system to a multilingual system (1993)
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Broughton, V.: Structural, linguistic and mathematical elements in indexing languages and search engines : implications for the use of index languages in electronic and non-LIS environments (2000)
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