Need to categorize: A comparative look at the categories of the   Universal Decimal Classification system (UDC) and Wikipedia
  This study analyzes the differences between the category structure of the Universal Decimal Classification (UDC) system (which is one of the widely used library classification systems in Europe) and Wikipedia. In particular, we compare the emerging structure of category-links to the structure of classes in the UDC. With this comparison we would like to scrutinize the question of how do knowledge maps of the same domain differ when they are created socially (i.e. Wikipedia) as opposed to when they are created formally (UDC) using classificatio theory. As a case study, we focus on the category of "Arts". 
Almila Akdag Salah, Cheng Gao, Krzysztof Suchecki, Andrea Scharnhorst
cs.DL cs.IR physics.soc-ph