Conceptual Structures - Broadening the Base. Proc. 9th International Conference on Conceptual Structures.
LNAI. volume 2120. Springer, Heidelberg, 2001.
H. Delugach and G. Stumme.
[BibTeX] 

Contextual-Logic Extension of TOSCANA..
In: B. Ganter and G. W. Mineau, editors, Conceptual Structures: Logical, Linguistic, and Computational, volume 1867, series LNAI, pages 453-467. Springer, Heidelberg, 2000.
P. Eklund, B. Groh, G. Stumme and R. Wille.
[doi]  [BibTeX] 

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

Conceptual Structures Represented by Conceptual Graphs and Formal Concept Analysis.
In: W. Tepfenhart and W. Cyre, editors, Conceptual Structures: Standards and Practices. Proc. ICCS '99, volume 1640, series LNAI, pages 423-441. Springer, Heidelberg, 1999.
Guy Mineau, Gerd Stumme and Rudolf Wille.
[doi]  [BibTeX]