Martin Berglund, Henrik Björklund, Frank Drewes. Single-Rooted DAGs in Regular DAG Languages: Parikh Image and Path Languages. In Marco Kuhlmann, Tatjana Scheffler, editors, Proceedings of the 13th International Workshop on Tree Adjoining Grammars and Related Formalisms, TAG 2017, Umeå, Sweden, September 4-6, 2017. pages 94-101, Association for Computational Linguistics, 2017. [doi]
Abstract is missing.