S. Polovina, J. Cooke, and J. Loke. Proceedings of the 17th International Conference on Conceptual Structures (ICCS 2009), volume 5662 of Lecture Notes in Computer Science, page 247-256. Springer, (2009)
D. Corbett. Proceedings of the 12th International Conference on Conceptual Structures (ICCS 2004), volume 3127 of Lecture Notes in Computer Science, page 375-387. Springer, (2004)