Salem Benferhat Didier Dubois Laurent Garcia Henri Prade On the transformation between possibilistic logic bases and possibilistic causal networks. 135-173 2002 29 Int. J. Approx. Reasoning 2 http://dx.doi.org/10.1016/S0888-613X(01)00061-5 db/journals/ijar/ijar29.html#BenferhatDGP02