J. Correia. Proceedings of the 10th International Conference on Conceptual Structures (ICCS 2002), volume 2393 of Lecture Notes in Computer Science, page 62-76. Springer, (2002)
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.