J. Hereth. Conceptual Structures: Integration and Interfaces, 10th International
Conference on Conceptual Structures, ICCS 2002, Borovets, Bulgaria,
July 15-19, 2002, Proceedings, volume 2393 of Lecture Notes in Computer Science, page 62-76. Springer, (2002)
J. Hereth, G. Stumme, R. Wille, and U. Wille. Conceptual Structures: Logical, Linguistic, and Computational Issues. Proc. ICCS '00, volume 1867 of LNAI, page 421-437. Heidelberg, Springer, (2000)