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Universal decimal classification
International Federation for Documentation.
1957
Einführung in das Wesen der Dezimalklassifikation
Karl Fill
Research project for the evaluation of the UDC as the indexing language for a mechanized reference retrieval system
Robert R. Freeman
1965
An introduction to UDC
Jean M. Perreault
1969
Towards a theory for UDC
Modern approaches to the management of a classificaton
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Computer-aided indexing of a scientific abstracts journal by the UDC with UNIDEK
Russell, Martin.
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Universal decimal classification =
British Standards Institution.
1947
