João C. P. da Silva, Sheila R. M. Veloso. A Sphere World Semantics for Default Reasoning. In V. Wiktor Marek, Anil Nerode, editors, Logic Programming and Nonmonotonic Reasoning, Third International Conference, LPNMR 95, Lexington, KY, USA, June 26-28, 1995, Proceedings. Volume 928 of Lecture Notes in Computer Science, pages 175-188, Springer, 1995.
Abstract is missing.