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