Tatjana Petkovic, Miroslav Ciric, Stojan Bogdanovic. Characteristic Semigroups of Directable Automata. In Masami Ito, Masafumi Toyama, editors, Developments in Language Theory, 6th International Conference, DLT 2002, Kyoto, Japan, September 18-21, 2002, Revised Papers. Volume 2450 of Lecture Notes in Computer Science, pages 417-427, Springer, 2002. [doi]
Abstract is missing.