S. Heymans, T. Eiter, and G. Xiao. Proc. of 19th European Conference on Artificial Intelligence (ECAI), volume 215 of Frontiers in Artificial Intelligence and Applications, page 35--40. IOS Press, (2010)
S. Heymans, R. Korf, M. Erdmann, J. Pührer, and T. Eiter. Proc. of the 2010 IEEE/WIC/ACM International Conference on Web Intelligence and Intelligent Agent Technology, 1, page 248--255. (2010)
S. Heymans, T. Eiter, and G. Xiao. Proc. of 19th European Conference on Artificial Intelligence (ECAI), volume 215 of Frontiers in Artificial Intelligence and Applications, page 35--40. IOS Press, (2010)