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Salton, G.: Experiments in automatic thesaurus construction for information retrieval (1972)
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Hutchins, W.J.: Languages of indexing and classification : a linguistic study of structures and functions (1978)
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Bhattacharyya, G.: ¬A general theory of subject headings (1974)
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- Library science with a slant to documentation. 11(1974), S.23-29