Transforming Projective Bilexical Dependency Grammars into efficiently-parsable CFGs with Unfold-Fold Mark Johnson author 2007-06 text Proceedings of the 45th Annual Meeting of the Association of Computational Linguistics Annie Zaenen editor Antal van den Bosch editor Association for Computational Linguistics Prague, Czech Republic conference publication johnson-2007-transforming https://aclanthology.org/P07-1022/ 2007-06 168 175