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Bhattacharyya, G.: POPSI: a system for depth indexing (1985)
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Bhattacharyya, G.: ¬A general theory of subject headings (1974)
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Bhattacharyya, G.: Project on study of subjects (1975)
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Bhattacharyya, G.: Chain procedure and structuring of a subject (1972)
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Bhattacharyya, G.: Classifying by UDC and CC: a comparative study (1972)
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Chang, R.: Keyword searching and indexing (1993)
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Levasseur, D.: ¬L'¬enjeu de la gestion documentaire electronique (GDE) (1997)
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Foskett, A.C.: ¬The subject approach to information (1996)
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