1. Anderson, A.R., Belnap Jr., N.D.: Entailment: The Logic of Relevance and Necessity, vol. I. Princeton University Press, Princeton (1975)
2. Anderson, A.R., Belnap Jr., N.D., Dunn, J.M.: Entailment: The Logic of Relevance and Necessity, vol. II. Princeton University Press, Princeton (1992)
3. Anderson, B.: “Discovery” in Legal Decision-Making. Kluwer Academic, Dordrecht (1996)
4. Aqvist, L.: Deontic Logic. In: Gabbay, D., Guenthner, F. (eds.) Handbook of Philosophical Logic, 2nd edn., vol. 8, pp. 147–264. Kluwer Academic, Dordrecht (2002)
5. Frontiers in Artificial Intelligence and Applications;J. Cheng,2000