Artur Jez, Alexander Okhotin. Unambiguous Conjunctive Grammars over a One-Letter Alphabet. In Marie-Pierre Béal, Olivier Carton, editors, Developments in Language Theory - 17th International Conference, DLT 2013, Marne-la-Vallée, France, June 18-21, 2013. Proceedings. Volume 7907 of Lecture Notes in Computer Science, pages 277-288, Springer, 2013. [doi]
Abstract is missing.