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Liu, S.: Decomposing DDC synthesized numbers (1996)
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Subrahmanyam, B.: Library of Congress Classification numbers : issues of consistency and their implications for union catalogs (2006)
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Satija, M.P.: History of book numbers (1987)
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Choi, I.: Visualizations of cross-cultural bibliographic classification : comparative studies of the Korean Decimal Classification and the Dewey Decimal Classification (2017)
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Gowtham, M.S.; Kamat, S.K.: ¬An expert system as a tool to classification (1995)
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