J. Reynar, and A. Ratnaparkhi. Proceedings of the fifth conference on Applied natural language processing, page 16--19. Stroudsburg, PA, USA, Association for Computational Linguistics, (1997)
R. McDonald, and G. Satta. Proceedings of the 10th International Conference on Parsing Technologies, page 121--132. Stroudsburg, PA, USA, Association for Computational Linguistics, (2007)