Parsing Ambiguous Structures using Controlled Disjunctions and Unary Quasi-Trees Philippe Blache author 1998-08 text 36th Annual Meeting of the Association for Computational Linguistics and 17th International Conference on Computational Linguistics, Volume 1 Association for Computational Linguistics Montreal, Quebec, Canada conference publication blache-1998-parsing-ambiguous 10.3115/980845.980866 https://aclanthology.org/P98-1019/ 1998-08 124 130