J. Correia, and G. Stumme. Proceedings of the 9th International Conference on Conceptual Structures (ICCS 2001), volume 2120 of Lecture Notes in Computer Science, page 202-215. Springer, (2001)
G. Stumme, R. Wille, and U. Wille. Principles of Data Mining and Knowledge Discovery Proc. 2nd European Symposium on PKDD'98, volume 1510 of LNAI, page 450-458. Heidelberg, (1998)Part of hereth03conceptual.