Pseudo-Projectivity: A Polynomially Parsable Non-Projective Dependency Grammar Sylvain Kahane author Alexis Nasr author Owen Rambow author 1998 text COLING 1998 Volume 1: The 17th International Conference on Computational Linguistics conference publication kahane-etal-1998-pseudo https://aclanthology.org/C98-1102/ 1998