... Languages, in: U.Reyle and C.Rohrer (eds.)Natural Language Parsing and Lin- guistic Theories, 69-94, 1988. [Joshi, Vijay-Shanker, and Weir, 1989] A. K. Joshi, K. Vijay-Shanker, and D. J. Weir. The ... Weir, and Joshi, 1986] K. Vijay- Shanker, D. J. Weir, and A. K. Joshi. Tree adjoining and head wrapping. 11th International Conference on Comput. Ling. 1986. [Vijay-Shanker, Weir, and Joshi, ... D. H. Younger. Recognitio_n and parsing context-free languages in time n 3. lnf Con- trol, 10, 189-208. 367 NEW FRONTIERS BEYOND CONTEXT-FREENESS: DI-GRAMMARS AND DI-AUTOMATA. Peter Staudacher...