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Krötzsch, M.; Hitzler, P.; Ehrig, M.; Sure, Y.: Category theory in ontology research : concrete gain from an abstract approach (2004 (?))
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Hitzler, P.; Krötzsch, M.; Rudolph, S.; Sure, Y.: Semantic Web : Grundlagen (2008)
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Hitzler, P.; Krötzsch, M.; Rudolph, S.: Foundations of Semantic Web technologies (2010)
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