Question Answering Based on Semantic Structures Srini Narayanan author Sanda Harabagiu author 2004-aug 23–aug 27 text COLING 2004: Proceedings of the 20th International Conference on Computational Linguistics COLING Geneva, Switzerland conference publication narayanan-harabagiu-2004-question https://aclanthology.org/C04-1100/ 2004-aug 23–aug 27 693 701