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C. Ullrich, und O. Ilghami. STAIRS 2006, Proceedings of the Third Starting AI Researchers' Symposium, Volume 142 von Frontiers in Artificial Intelligence and Applications, Seite 271--272. Riva del Garda, Italy, IOS Press, (August 2006)
C. Groß, M. Moormann, und C. Ullrich. DES-Time 2006, Proceedings of the International Symposium on Technology and its Integration into Mathematics Education 2006, Dresden, Germany, (Juli 2006)
P. Kärger, C. Ullrich, und E. Melis. Proceedings of the 6th IEEE International Conference on Advanced Learning Technologies, Seite 845--846. IEEE Computer Society, (Juli 2006)