1. Moldovan, D., Harabagio, S., Girju, R., Morarescu, P., Lacatsu, F., Novischi, A.: LCC Tools for Question Answering. In: Proc. of TREC 2002 (2002)
2. Hovy, E.H., Hermjakob, U., Lin, C.Y.: The Use of External Knowledge of Factoid QA. In: Proc. of TREC 2001 (2001)
3. Ravichandran, D., Hovy, E.: Learning Surface Text Patterns for a Question Answering. In: Proc. of ACL Conference (2002)
4. Ittycheriah, A., Roukos, S.: IBM’s Statistical Question Answering System-TREC 11. In: Proc. of TREC, Gaithersburg, Maryland, November (2002)
5. Emmanuel, A.C., Croft, W.B., Murdock, V.: Answer Passage Retrieval for Question Answering. In: Proc. of SIGIR2004, pp. 516–517 (2004)