Mineau, Guy, Stumme, Gerd and Wille, Rudolf. "Conceptual Structures Represented by Conceptual Graphs and Formal Concept Analysis." Paper presented at the meeting of the Conceptual Structures: Standards and Practices. Proc. ICCS '99, Heidelberg, 1999.

Prediger, S. and Stumme, G.. "Theory-Driven Logical Scaling." Paper presented at the meeting of the Proc. 6th Intl. Workshop Knowledge Representation Meets Databases (KRDB'99), 1999.

Skorsky, M., Stumme, G., Wille, R. and Wille, U.. "Reuse in the Development Process of TOSCANA Systems." Paper presented at the meeting of the Proc. Workshop on Knowledge Management, Organizational Memory and Reuse, 5th German Conf. on, Würzburg, 1999.

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

Stumme, G.. "Hierarchies of Conceptual Scales." Paper presented at the meeting of the Proc.Workshop on Knowledge Acquisition, Modeling and Management (KAW'99), 1999.

Stumme, G. and Wolff, K. E.. "Numerical Aspects in the Data Model of Conceptual Information Systems." Paper presented at the meeting of the Advances in Database Technologies. Proc. Intl. Workshop on Data Warehousing and, Heidelberg, 1999.

Stumme, Gerd. "Acquiring Expert Knowledge for the Design of Conceptual Information Systems." Paper presented at the meeting of the Knowledge Acquisition, Modeling, and Management. Proc. 11th European, Heidelberg, 1999.

Stumme, Gerd. "Dual Retrieval in Conceptual Information Systems." Paper presented at the meeting of the Datenbanksysteme in Büro, Technik und Wissenschaft. Proc. BTW'99, Heidelberg, 1999.