A. Sun, R. Grishman, W. Xu, and B. Min. Proceedings of the Fourth Text Analysis Conference (TAC 2011), National Institute of Standards and Technology (NIST), (November 2011)
K. Taghva, R. Beckley, and J. Coombs. Proceedings of the 19th International Conference on Conceptual Structures (ICCS 2011), volume 6828 of Lecture Notes in Computer Science, page 339-345. Springer, (2011)