Transforming Lattices into Non-deterministic Automata with Optional Null Arcs Mark Seligman author Christian Boitet author Boubaker Meddeb-Hamrouni author 1998 text COLING 1998 Volume 2: The 17th International Conference on Computational Linguistics conference publication seligman-etal-1998-transforming https://aclanthology.org/C98-2192/ 1998