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Grolier, E. de: ¬A study of general categories applicable to classification and coding in documentation (1962)
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Srivastava, A.P.: Theory of knowledge classification in libraries (1964)
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Ranganathan, S.R.; Gopinath, M.A.: Prolegomena to library classification (1967)
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Moss, R.: Categories and relations : Origins of two classification theories (1964)
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Hillman, D.J.: Mathematical classification techniques for nonstatic document collections, with particular reference to the problem of relevance (1965)
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