Verifying context-sensitive treebanks and heuristic parses in polynomial time Anders Søgaard author 2009-05 text Proceedings of the 17th Nordic Conference of Computational Linguistics (NODALIDA 2009) Kristiina Jokinen editor Eckhard Bick editor Northern European Association for Language Technology (NEALT) Odense, Denmark conference publication sogaard-2009-verifying https://aclanthology.org/W09-4627/ 2009-05 190 197