M. Atzmueller, and F. Puppe. Proc. 10th European Conference on Principles and Practice of Knowledge Discovery in Databases (PKDD 2006), 4213, page 6-17. (2006)
M. Atzmueller, and F. Puppe. Proc. 15th International Conference on Knowledge Engineering and Knowledge Management (EKAW 2006), 4248, page 318--325. (2006)