T.  Tserendorj, Grimm, S., and Hitzler, P., ?Approximate Instance Retrieval on Ontologies?, in Database and Expert Systems Applications, 21st International Conference, DEXA 2010, Bilbao, Spain, 2010, vol. 6261, pp. 503?511.

S.  Grimm and Hitzler, P., ?A Preferential Tableaux Calculus for Circumscriptive ALCO?, in Web Reasoning and Rule Systems, Third International Conference, RR 2009, Chantilly, VA, USA, 2009, vol. 5837, pp. 40?54.

S.  Grimm and Hitzler, P., ?Proceedings of the Fourth International Workshop on Applications of Semantic Technologies, AST2009, at Informatik2009, Lübeck, Germany, October 2009?, INFORMATIK 2009 - Im Fokus das Leben. Bonner Köllen Verlag, Lübeck, Germany, pp. 381-400, 2009.