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Riesthuis, G.J.A.: Subject searching in merged catalogues : a plea for redundancy (2008)
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Moore, N.L.: LISA indexing : economic aspects of controlled indexing (1988)
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Gödert, W.: Facet classification in online retrieval (1991)
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Mitchell, J.S.: Relationships in the Dewey Decimal Classification system (2001)
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Bloomfield, M.: ¬A look at subject headings : a plea for standardization (1993)
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