1. Acid, S., Campos,L.M.de, González, A., Molina, R. and Pérez de la Blanca, N. (1991) CASTLE: Causal Structures from Inductive Learning. Release 1.0. Technical Report no 91-4-1. Dept of Computer Science and A.I. (DECSAI). University of Granada.
2. Aho, A.V., Hopcroft, J.E. and Ullman, J.E. (1987) Data Structures and Algorithms. Addison-Wesley.
3. Molina, R. and Ripley, B.D. (1989). Using spatial models as priors in image analysis. J. Appl. Statist, 16, 193–206.
4. Pearl, J. (1988) Probabilistic Reasoning in Intelligent Systems: Networks of Plausible Inference. Morgan and Kaufmann.
5. Pearl, J. and Verma, T.S. (1990) A Formal Theory of Inductive Causation. Technical Report R-155 Department of Computer Science. University of California.