Open Ontologies - The Need for Modeling Heterogeneous Knowledge. - Tina Froehner; Matthias Nickles; Gerhard Weiß 001 (IKE, 2004)

Social Annotation of Semantically Heterogeneous Knowledge. - Matthias Nickles; Tina Froehner; Gerhard Weiß 001 (SemAnnot@ISWC, 2004)

Multi-Source Knowledge Bases and Ontologies with Multiple Individual and Social Viewpoints. - Matthias Nickles; Ruth Cobos; Gerhard Weiß 001; Tina Froehner (Web Intelligence, 2005)

Integration of Ontologies and Knowledge from Distributed Autonomous Sources. - Tina Froehner; Matthias Nickles; Gerhard Weiß 001; Wilfried Brauer; Rolf Franken (Künstliche Intell., 2005)