Mineau, G., Stumme, G. & Wille, R. (1999). Conceptual Structures Represented by Conceptual Graphs and Formal Concept Analysis. In W. Tepfenhart & W. Cyre (eds.), Conceptual Structures: Standards and Practices. Proc. ICCS '99 (p./pp. 423-441), Heidelberg: Springer.

Prediger, S. & Stumme, G. (1999). Theory-Driven Logical Scaling. In E. F. et al (ed.), Proc. 6th Intl. Workshop Knowledge Representation Meets Databases (KRDB'99), .

Skorsky, M., Stumme, G., Wille, R. & Wille, U. (1999). Reuse in the Development Process of TOSCANA Systems. In F. Puppe, D. Fensel, J. Kühler, R. Studer & T. Wetter (eds.), Proc. Workshop on Knowledge Management, Organizational Memory and Reuse, 5th German Conf. on, March 3-5,, Würzburg.

Stumme, G. (1999). Conceptual Knowledge Discovery with Frequent Concept Lattices ({FB}4-{P}reprint 2043). TU Darmstadt .

Stumme, G. (1999). Hierarchies of Conceptual Scales. In T. B. Gaines, R. Kremer & M. Musen (eds.), Proc.Workshop on Knowledge Acquisition, Modeling and Management (KAW'99) (p./pp. 78-95), Oct 16-22, : Banff.

Stumme, G. & Wolff, K. E. (1999). Numerical Aspects in the Data Model of Conceptual Information Systems. In Y. Kambayashi, D. K. Lee, E.-P. Lim, M. K. Mohania & Y. Masunaga (eds.), Advances in Database Technologies. Proc. Intl. Workshop on Data Warehousing and (p./pp. 117-128), Heidelberg: Springer.

Stumme, G. (1999). Acquiring Expert Knowledge for the Design of Conceptual Information Systems. In D. Fensel & R. Studer (eds.), Knowledge Acquisition, Modeling, and Management. Proc. 11th European (p./pp. 275-290), Heidelberg: Springer.

Stumme, G. (1999). Dual Retrieval in Conceptual Information Systems. In A. Buchmann (ed.), Datenbanksysteme in Büro, Technik und Wissenschaft. Proc. BTW'99 (p./pp. 328-342), Heidelberg.