6Voiskunskii V G.Evaluation of Search Results:A New Approach[J].Journal of the American Society for Infomation Science,1997,48(2):133-142.
7Raghavan V V,Bollman P,Jung G S.Retrieval System Evaluation Using recall and precision:Problems and Answers[C]//Proceedings of the Twelfth Annual International ACM SIGIR Conference on Research and Development in Information Retrieval.Cambridge,UK:[s.n.],1989:59-68.
