@Techreport{surevetter2005ctiorcgfaaa, author = "York Sure-Vetter and Markus Kr{\"o}tzsch and Marc Ehrig and Pascal Hitzler", institution = "AIFB, Universit{\"a}t Karlsruhe", title = "Category Theory in Ontology Research: Concrete Gain from an Abstract Approach", year = "2005", }