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K. Becker, G. Stumme, R. Wille, U. Wille, and M. Zickwolff. Knowledge Engineering and Knowledge Management. Methods, Models, and Tools., volume 1937 of LNAI, page 352-365. Heidelberg, Springer, (2000)
G. Stumme, and K. Wolff. Advances in Database Technologies. Proc. Intl. Workshop on Data Warehousing and, volume 1552 of LNCS, page 117-128. Heidelberg, Springer, (1999)