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Dahlberg, I.: Major developments in classification (1977)
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Dahlberg, I.: Grundlagen universaler Wissensordnung : Probleme und Möglichkeiten eines universalen Klassifikationssystems des Wissens (1974)
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Batley, S.: Classification in theory and practice (2005)
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Chatterjee, A.: Universal Decimal Classification and Colon Classification : their mutual impact (2015)
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Panigrahi, P.: Ranganathan and Dewey in hierarchical subject classification : some similarities (2015)
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