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Bhattacharyya, G.: POPSI: a system for depth indexing (1985)
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Biswas, S.C.; Smith, F.: Classed thesauri in indexing and retrieval : a literature review and critical evaluation of online alphabetic classaurus (1989)
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Devadason, F.J.: Computerization of Deep Structure Based Indexes (1985)
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Devadason, F.J.: Postulate-Based Permuted Subject Indexing Language as a metalanguage for computer-aided generation of information retrieval thesaurus (1983)
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