Conceptual Structures -- Broadening the Base. Proc. 9th International Conference on Conceptual Structures. Delugach, H. and Stumme, G., eds. , Springer , Heidelberg (2001). .

Eklund, P., Groh, B., Stumme, G. and Wille, R.. "Contextual-Logic Extension of TOSCANA.." Paper presented at the meeting of the Conceptual Structures: Logical, Linguistic, and Computational, Heidelberg, 2000.

Working with Conceptual Structures -- Contributions to ICCS 2000. Suppl. Proc. 8th International
Conference on Conceptual Structures (ICCS 2000). Stumme, G., eds. , Shaker , Aachen (2000). .

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.