Ho-Pun Lam, Guido Governatori. What Are the Necessity Rules in Defeasible Reasoning?. In James P. Delgrande, Wolfgang Faber, editors, Logic Programming and Nonmonotonic Reasoning - 11th International Conference, LPNMR 2011, Vancouver, Canada, May 16-19, 2011. Proceedings. Volume 6645 of Lecture Notes in Computer Science, pages 187-192, Springer, 2011. [doi]
Abstract is missing.