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Need to Categorize: A Comparative Look at the Categories of Universal Decimal Classification System and WikipediaVisualizing Universes of Knowledge: Design and Visual Analysis of the UDCThe evolution of classification systems: ontogeny of the UDC.Evolution of Wikipedia’s Category StructureThe Evolution of Knowledge, and its Representation in Classification SystemsHighly connected - a recipe for successNeed to categorize: A comparative look at the categories of the Universal Decimal Classification system (UDC) and Wikipedia