Fast Context-Free Parsing Requires Fast Boolean Matrix Multiplication Lillian Lee author 1997-07 text 35th Annual Meeting of the Association for Computational Linguistics and 8th Conference of the European Chapter of the Association for Computational Linguistics Association for Computational Linguistics Madrid, Spain conference publication lee-1997-fast 10.3115/976909.979619 https://aclanthology.org/P97-1002/ 1997-07 9 15