Stumme, G. ; Wolff, K. E. ; Kambayashi, Y. (Bearb.) ; Lee, Dik Kun (Bearb.) ; Lim, Ee-Peng (Bearb.) ; Mohania, M. K. (Bearb.) ; Masunaga, Y. (Bearb.): Numerical Aspects in the Data Model of Conceptual Information Systems. 1552. In: Advances in Database Technologies. Proc. Intl. Workshop on Data Warehousing and. Heidelberg : Springer, 1999 (LNCS), S. 117-128
Stumme, Gerd ; Fensel, D. (Bearb.) ; Studer, R. (Bearb.): Acquiring Expert Knowledge for the Design of Conceptual Information Systems. 1621. In: Knowledge Acquisition, Modeling, and Management. Proc. 11th European. Heidelberg : Springer, 1999 (LNAI), S. 275-290
Stumme, Gerd ; Buchmann, A. (Bearb.): Dual Retrieval in Conceptual Information Systems. In: Datenbanksysteme in Büro, Technik und Wissenschaft. Proc. BTW'99. Heidelberg, 1999, S. 328-342