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Foskett, A.C.: ¬The subject approach to information (1996)
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Paijmans, H.: Comparing the document representation of two IR-systems : CLARIT and TOPIC (1993)
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Kumar, T.V.R.; Parameswaran, M.: Chain indexing and LISA (1998)
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Parameswaran, M.: Chain procedure and Dewey Decimal Classification (1990)
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Patwardhan, D.V.: Chain indexing : a new look at old technique (1988)
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