F. Nothdurft, G. Bertrand, T. Heinroth, and W. Minker. Proceedings of the Sixth International Conference on Intelligent Environments (IE 2010), Kuala Lumpur, Malaysia, page 90-95. Los Alamitos, CA, IEEE Computer Society CPS, (2010)
W. Maass, and A. Filler. Proceedings of the Workshop on Making Semantics Work For Business (MSWFB 2007), part of 1st European Semantic Technology Conference, Vienna, Austria, page 12-17. (2007)