The complexity of finding the maximum spanning DAG and other restrictions for DAG parsing of natural language Natalie Schluter author 2015-06 text Proceedings of the Fourth Joint Conference on Lexical and Computational Semantics Martha Palmer editor Gemma Boleda editor Paolo Rosso editor Association for Computational Linguistics Denver, Colorado conference publication schluter-2015-complexity 10.18653/v1/S15-1031 https://aclanthology.org/S15-1031/ 2015-06 259 268