S. Acid, and L. Campos. Proc. of Sixth International Conference of Information Processing and Management of Uncertainty in Knowledge-Based Systems, (1996)
J. Halpern, and J. Pearl. Proceedings of the Seventeenth Conference on Uncertainty in Artificial Intelligence, page 194-202. San Francisco, CA, Morgan Kaufmann, (2001)
E. Hruschka Jr, E. Hruschka, and N. Ebecken. Proceedings of the 7h Canadian Conference on Artificial Intelligence, 3060, page 370-379. Springer-Verlag, (2004)