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Chatterjee, A.: Universal Decimal Classification and Colon Classification : their mutual impact (2015)
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Satija, M.P.: Library classification : an essay in terminology (2000)
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Berman, S.: DDC 20 : the scam continues (1989)
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Dewey, M.: Decimal classification beginnings (1990)
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Ranganathan, S.R.: Facet analysis: fundamental categories (1985)
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