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Frias, J.A.: ¬La estructura conceptual del registro bibliografico : una revision (1996)
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Niu, J.: Hierarchical relationships in the bibliographic universe (2013)
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German, L.: Bibliographic utilities (2009)
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Drabenstott, K.M.: ¬The need for machine-readable authority records for topical subdivisions (1992)
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Drabenstott, K.M.: Period subdivisions in the Library of Congress Subject Headings system : some thoughts and recommendations for the future (1992)
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