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

Prediger, S. & Stumme, G. (1999), Theory-Driven Logical Scaling, in E. Franconi 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 & Th. Wetter, ed.,'Proc. Workshop on Knowledge Management, Organizational Memory and Reuse, 5th German Conf. on'.

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

Stumme, G. (1999), Hierarchies of Conceptual Scales, in T. B. Gaines; R. Kremer & M. Musen, ed.,'Proc.Workshop on Knowledge Acquisition, Modeling and Management (KAW'99)', Banff, , pp. 78-95.

Stumme, G. & Wolff, K. E. (1999), Numerical Aspects in the Data Model of Conceptual Information Systems, in Y. Kambayashi; Dik Kun Lee; Ee-Peng Lim; M. K. Mohania & Y. Masunaga, ed.,'Advances in Database Technologies. Proc. Intl. Workshop on Data Warehousing and', Springer, Heidelberg, pp. 117-128.

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

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