G. Stumme. Proceedings of the 12th International Conference on Conceptual Structures (ICCS 2004), volume 3127 of Lecture Notes in Computer Science, page 109-125. Springer, (2004)
P. Eklund, B. Groh, G. Stumme, and R. Wille. Conceptual Structures: Logical, Linguistic and Computational Issues: 8th International Conference on Conceptual Graphs, ICCS'99, 1867, page 453-467. Springer Verlag, (2000)see Goda project description for details of this collaboration.