Mineau, Guy ; Stumme, Gerd ; Wille, Rudolf ; Tepfenhart, W. (Bearb.) ; Cyre, W. (Bearb.): Conceptual Structures Represented by Conceptual Graphs and Formal Concept Analysis. 1640. In: Conceptual Structures: Standards and Practices. Proc. ICCS '99. Heidelberg : Springer, 1999 (LNAI), S. 423-441

Prediger, S. ; Stumme, G. ; et al, E. Franconi (Bearb.): Theory-Driven Logical Scaling. CEUR Workshop Proc. 21. In: Proc. 6th Intl. Workshop Knowledge Representation Meets Databases (KRDB'99), 1999. - Also in: P. Lambrix et al (Eds.): Proc. Intl. Workshop on Description Logics (DL'99). CEUR Workshop Proc. 22, 1999 \url{http://ceur-ws.org/Vol-21}

Skorsky, M. ; Stumme, G. ; Wille, R. ; Wille, U. ; Puppe, F. (Bearb.) ; Fensel, D. (Bearb.) ; Kühler, J. (Bearb.) ; Studer, R. (Bearb.) ; Wetter, Th. (Bearb.): Reuse in the Development Process of {TOSCANA} Systems. In: Proc. Workshop on Knowledge Management, Organizational Memory and Reuse, 5th German Conf. on. Würzburg, 1999

Stumme, G. ; TU Darmstadt (Hrsg.): Conceptual Knowledge Discovery with Frequent Concept Lattices, 1999

Stumme, G. ; Gaines, T. B. (Bearb.) ; Kremer, R. (Bearb.) ; Musen, M. (Bearb.): Hierarchies of Conceptual Scales. 2. In: Proc.Workshop on Knowledge Acquisition, Modeling and Management (KAW'99) : Banff, 1999, S. 78-95

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