6Grabtree I, Soltysiak S. Identifying and Tracking Changing Interests[J]. International Journal of Digital Libraries, 1998, 2( 1 ): 38.
7Widmer G, Kubat M. Learning in the Presence of Concept Drift and Hidden Contexts[J]. Machine Learning, 1996,23(1 ): 69.
8Maloof M, Michalski S. Learning Evolving Concepts Using a Partial Memory Approach[C]. Working Notes of the AAAI Fall Symposium on Active Learning, Boston, MA, 1995-11 : 10-12.
9Widmer G. Tracking Changes Through Meta-Learning [J]. Machine Learning, 1997,27(3):259-286.
10Koychev I. Gradual Forgetting for Adaptation to Concept Drift[C]. Proceedings of ECAI 2000 Workshop, 2000:101.
6Wilson DT, et al. Models of the infonnafion user: progress and prospects in research [ A]. Sweeney GP: INFORMATION AND THE TRANSFORMATION OF SOCIETY [C]. Amstenun: North Holland Publishing Company, 1982:361-367.
