1. Bunt, H., Alexandersson, J., et al.: Towards an ISO Standard for Dialogue Act Annotation. In: LREC (2010)
2. Eduard, H., Gerber, L.: et al.: Question Answering in Webclopedia. In: Proceedings of the Ninth Text Retrieval Conference, pp. 655–664 (2000)
3. Graesser, A., Rus, V., Cai, Z.: Question classification schemes. In: Workshop on the Question Generation Shared Task and Evaluation Challenge pp. 8–9 (2008)
4. Hirschman, L., Gaizauskas, R.: Natural language question answering: the view from here. Nat. Lang. Eng. 7, 275–300 (2001)
5. Moldovan, D.I., et al.: LASSO: A Tool for Surfing the Answer Net. In: Text Retrieval Conference (1999)