2Milad S. Central-rank-based collection selection in un- cooperative distributed information retrieval [C] // Proc of the 29th European Conference on IR Research. Heidelberg: Springer-Verlag, 2007: 160-172.
3Hong D, Si L, Bracke P, et al. A joint probabilistic classification model for resource selection :C] //Proe of the 33rd International ACM SIGIR Conference on Research and Development in Information Retrieval (SIGIRrl0). New York: ACM, 2010: 98-105.
4Liu V Z, Luo R C, Chu W W. Dprot A probabilistic approach for hidden Web database selection using dy- namic probing [C] //Proc of the 20th Int'l Conf. on Data Engineering ( ICDE ' 04 ). Washington. IEEE Computer Society, 2004: 1-12.
5Nguyen K,Cao J. K-Graphs: Selecting top-k data sources for XML keyword Queries [(3] //Proc of 22nd Int'l Conf on Database and Expert Systerrts Applications. Heidelberg: Springer-Verlag, 2011: 425-439.
