J. Herbst, and D. Karagiannis. Proceedings of the Ninth International Workshop on Database and Expert Systems Applications, page 745--752. IEEE, (1998)
J. Herbst, and D. Karagiannis. Proceedings of the IJCAI'99 Workshop on Intelligent Workflow
and Process Management: The New Frontier for AI in Business, page 52--57. Stockholm, Sweden, (August 1999)
D. Karagiannis, H. Fill, P. Höfferer, and M. Nemetz. Information Systems and e-Business Technologies, volume 5 of Lecture Notes in Business Information Processing, Springer Berlin Heidelberg, 10.1007/978-3-540-78942-0_19.(2008)