Werner Kuich. Why We Need Semirings in Automata Theory (Extended Abstract). In Andreas Maletti, editor, Algebraic Informatics - 6th International Conference, CAI 2015, Stuttgart, Germany, September 1-4, 2015. Proceedings. Volume 9270 of Lecture Notes in Computer Science, pages 43-44, Springer, 2015. [doi]
Abstract is missing.