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Lopes, M.I.: Principles underlying subject heading languages : an international approach (1996)
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Hoerman, H.L.; Furniss, K.A.: Turning practice into principles : a comparison of the IFLA Principles underlying Subject Heading Languages (SHLs) and the principles underlying the Library of Congress Subject Headings system (2000)
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Principles underlying subject heading languages (SHLs) (1999)
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