S. Heymans, T. Eiter, и G. Xiao. Proc. of 19th European Conference on Artificial Intelligence (ECAI), том 215 из Frontiers in Artificial Intelligence and Applications, стр. 35--40. IOS Press, (2010)
M. Ortiz, S. Rudolph, и M. Simkus. Principles of Knowledge Representation and Reasoning: Proceedings of the Twelfth International Conference (KR-10), стр. 269-279. AAAI Press, (мая 2010)