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Vickery, B.C.: Systematic subject indexing (1985)
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Classification Research Group: ¬The need for a faceted classification as the basis of all methods of information retrieval (1985)
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Frohmann, B.P.: ¬An investigation of the semantic bases of some theoretical principles of classification proposed by Austin and the CRG (1983)
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Green, R.: Facet analysis and semantic frames (2017)
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