C. Ullrich, Q. Chen, S. Chen, L. Shen, and R. Shen. Proceedings of the 15th International Conference on Computers in Education (ICCE2007), Hiroshima, Japan, IOS Press, (2007)in print.
E. Melis, R. Shen, J. Siekmann, C. Ullrich, F. Yang, and P. Han. Proceedings of the 2005 Joint Chinese-German Workshop on Cognitive Systems, volume 4429 of Lecture Notes in Artificial Intelligence, page 36--44. Shanghai, China, Springer-Verlag, (2007)
C. Groß, M. Moormann, and C. Ullrich. DES-Time 2006, Proceedings of the International Symposium on Technology and its Integration into Mathematics Education 2006, Dresden, Germany, (July 2006)
O. Rostanin, C. Ullrich, H. Holz, and S. Song. Proceedings: I-KNOW'06, 6th International Conference on Knowledge Management, page 395--402. Graz, Austria, (September 2006)
C. Ullrich, and O. Ilghami. STAIRS 2006, Proceedings of the Third Starting AI Researchers' Symposium, volume 142 of Frontiers in Artificial Intelligence and Applications, page 271--272. Riva del Garda, Italy, IOS Press, (August 2006)
P. Kärger, C. Ullrich, and E. Melis. Innovative Approaches for Learning and Knowledge Sharing, Proceedings of the First European Conference on Technology Enhanced Learning, 4227, page 185--197. Heraklion, Greece, Springer-Verlag, (October 2006)
C. Brooks, J. Greer, E. Melis, and C. Ullrich. Proceedings of the 8th International Conference on Intelligent Tutor Systems, volume 4053 of LNCS, page 278--287. Jhongli, Taiwan, Springer-Verlag, (2006)
P. Kärger, C. Ullrich, and E. Melis. Proceedings of the 6th IEEE International Conference on Advanced Learning Technologies, page 845--846. IEEE Computer Society, (July 2006)
V. Izhutkin, V.I.Toktarova, and C. Ullrich. Proceedings of the Russian scientific conference on Scientific service in the Internet, page 153--154. Novorossiysk, (September 2003)in Russian.
C. Ullrich. Proceedings of Workshop on Applications of Semantic Web Technologies for E-learning, SW-EL'04, page 17--23. Hiroshima, Japan, (November 2004)
A. Merceron, C. Oliveira, M. Scholl, and C. Ullrich. Poster Proceedings of the 3rd International Semantic Web Conference, ISWC2004, page 39--40. Hiroshima, Japan, (November 2004)