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C. Ullrich, Q. Chen, S. Chen, L. Shen, и R. Shen. Proceedings of the 15th International Conference on Computers in Education (ICCE2007), Hiroshima, Japan, IOS Press, (2007)in print.
P. Kärger, C. Ullrich, и E. Melis. Innovative Approaches for Learning and Knowledge Sharing, Proceedings of the First European Conference on Technology Enhanced Learning, 4227, стр. 185--197. Heraklion, Greece, Springer-Verlag, (октября 2006)
O. Rostanin, C. Ullrich, H. Holz, и S. Song. Proceedings: I-KNOW'06, 6th International Conference on Knowledge Management, стр. 395--402. Graz, Austria, (сентября 2006)
C. Ullrich, и O. Ilghami. STAIRS 2006, Proceedings of the Third Starting AI Researchers' Symposium, том 142 из Frontiers in Artificial Intelligence and Applications, стр. 271--272. Riva del Garda, Italy, IOS Press, (августа 2006)
C. Groß, M. Moormann, и C. Ullrich. DES-Time 2006, Proceedings of the International Symposium on Technology and its Integration into Mathematics Education 2006, Dresden, Germany, (июля 2006)
P. Kärger, C. Ullrich, и E. Melis. Proceedings of the 6th IEEE International Conference on Advanced Learning Technologies, стр. 845--846. IEEE Computer Society, (июля 2006)