Graph Branch Algorithm: An Optimum Tree Search Method for Scored Dependency Graph with Arc Co-Occurrence Constraints Hideki Hirakawa author 2006-07 text Proceedings of the COLING/ACL 2006 Main Conference Poster Sessions Association for Computational Linguistics Sydney, Australia conference publication hirakawa-2006-graph https://aclanthology.org/P06-2047/ 2006-07 361 368