1. Ackerman, M., et al.: Learning Probabilistic User Profiles. AI Magazine 18(2), 47–56 (1997)
2. Armstrong, R., Freitag, D., Joachims, T., Mitchell, T.: WebWatcher: A Learning Apprentice for the World Wide Web, In: AAAI Spring Symposium on Information Gathering from Heterogeneous, Distributed Environments, AAAI Press, Menlo Park (1995)
3. Baeza-Yates, R., Ribeiro-Neto, B.: 5. Query Operations. In: Modern Information Retrieval, Addison Wesley, Reading (1999)
4. Gershon, N., LeVasseur, J., Winstead, J., Croall, J., Pernick, A., Ruh, W.: Case Study: Visualizing Internet Resources. In: Proc. Information Visualization (INFOVIS’95), pp. 122–128 (1995)
5. Hearst, M.A., Pedersen, J.O.: Reexaming the Cluster Hypothesis: Scatter/Gather on Retrieval Results. In: Proc. Of 19th Int’l ACM SIGIR Conference on Research and Development in Information Retrieval (SIGIR’96), pp. 76–84. ACM Press, New York (1996)