Werner Kuich. Omega-Continuous Semirings, Algebraich Systems and Pushdown Automata. In Mike Paterson, editor, Automata, Languages and Programming, 17th International Colloquium, ICALP90, Warwick University, England, July 16-20, 1990, Proceedings. Volume 443 of Lecture Notes in Computer Science, pages 103-110, Springer, 1990.
Abstract is missing.