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Veltman, K.: Thougths on the reorganization of knowledge (1983)
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Hjoerland, B.: Classification (2017)
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Kantardzic, M.: Data mining : concepts, models, methods, and algorithms (2003)
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Lorigo, L.; Pellacini, F.: Frequency and structure of long distance scholarly collaborations in a physics community : toward an emendation (2007)
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Yee, M.: Headings for tomorrow : public access display of subject headings (1992)
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