1. Anh, V.N., Moffat, A.: Impact transformation: effective and efficient web retrieval. In: Proc. ACM-SIGIR Int. Conf. on Research and Development in Information Retrieval, pp. 3–10. ACM Press, New York (2002)
2. Bailey, P., Craswell, N., Hawking, D.: Engineering a multi-purpose test collection for web retrieval experiments. Information Processing & Management 39(6), 853–871 (2003)
3. Billerbeck, B., Scholer, F., Williams, H.E., Zobel, J.: Query expansion using associated queries. In: Proc. Int. Conf. on Information and Knowledge Management, pp. 2–9. ACM Press, New York (2003)
4. Billerbeck, B., Zobel, J.: Questioning query expansion: An examination of behaviour and parameters. In: Schewe, K.-D., Williams, H.E. (eds.) Proc. Australasian Database Conf., vol. 27, pp. 69–76. CRPIT (2004)
5. Carpineto, C., de Mori, R., Romano, G., Bigi, B.: An information-theoretic approach to automatic query expansion. ACM Transactions on Information Systems 19(1), 1–27 (2001)