T. Mossakowski, Kolyang, and B. Krieg-Brückner. Recent Trends in Algebraic Development Techniques, 12th International Workshop, WADT’97, 1376, page 333-348. Springer-Verlag; D-69121 Heidelberg, Germany; http://www.springer.de, (1998)
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.
G. Stumme, R. Wille, and U. Wille. Principles of Data Mining and Knowledge Discovery, volume 1510 of Lecture Notes in Computer Science, Springer, Berlin/Heidelberg, (1998)