Christian Antic, Thomas Eiter, Michael Fink. Hex Semantics via Approximation Fixpoint Theory. In Pedro Cabalar, Tran Cao Son, editors, Logic Programming and Nonmonotonic Reasoning, 12th International Conference, LPNMR 2013, Corunna, Spain, September 15-19, 2013. Proceedings. Volume 8148 of Lecture Notes in Computer Science, pages 102-115, Springer, 2013. [doi]