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Takeda, N.: Problems in hierarchical structures in thesauri : their influences on the results of information retrieval (1994)
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- Online Kensaku. 15(1994) no.4, S.183-186
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Lopes, M.I.: Principles underlying subject heading languages : an international approach (1996)
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- International cataloguing and bibliographic control. 25(1995) no.1, S.10-12
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Principles underlying subject heading languages (SHLs) (1999)
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