A Machine-Learning Approach to Introspection in a Question Answering System Krzysztof Czuba author John Prager author Jennifer Chu-Carroll author 2002-07 text Proceedings of the 2002 Conference on Empirical Methods in Natural Language Processing (EMNLP 2002) Association for Computational Linguistics conference publication czuba-etal-2002-machine 10.3115/1118693.1118727 https://aclanthology.org/W02-1034/ 2002-07 265 272