Mineau, Guy, Stumme, Gerd, Wille, Rudolf ; Tepfenhart, W., Cyre, W.: 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: 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., Fensel, D., Kühler, J., Studer, R., Wetter, Th.: 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., Kremer, R., Musen, M.: 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., Lee, Dik Kun, Lim, Ee-Peng, Mohania, M. K., Masunaga, Y.: 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., Studer, R.: 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.: Dual Retrieval in Conceptual Information Systems. In: Datenbanksysteme in Büro, Technik und Wissenschaft. Proc. BTW'99. Heidelberg, 1999, S. 328-342