1. Breiman, L.: Bagging predictors. Machine Learning 24(2), 123–140 (1996)
2. Burger, J., et al.: Issues, Tasks and Program Structures to Roadmap Research in Question & Answering (Q&A). NIST (2001)
3. Carreras, X., Padró, L.: A Flexible Distributed Architecture for Natural Language Analyzers. In: Proceedings of the LREC 2002, Las Palmas de Gran Canaria, Spain (2002)
4. Cowie, J., et al.: Automatic Question Answering. In: Proceedings of the International Conference on Multimedia Information Retrieval, RIAO 2000 (2000)
5. Hirshman, L., Gaizauskas, R.: Natural Language Question Answering: The View from Here. Natural Language Engineering 7 (2001)