5Park,T.K. The nature of relevance in information retrieval:An em pirical study. Library Quarterly,1993,63(3):318～351
6Barry,C.L.The identification of user releyance criteria and document characteristics:Beyond the topical approach to information retrieval.Unpubli shed doctoral dissertation,Syracuse University,Syracuse,NY,1993
7Barry,C. L. User-defined relevance criteria:An exploratory study. Jour nal of the American Society for Information Science, 1994,45(3):149～159
8Wang,P.A cognitive model of document selection of real users of i nformation retrieval systems. Unpublished doctoral dissertation,University of Maryl and,College of Library and Information Science,College Park,MD,1994
9Wang,P.,＆ Soergel,D. A cognitive model of document use during a research project. Study I:Document selection. Journal of the American Society for Informa tion Science,1998,49(2):115～133
10Wang,P,White,M.D.A Cognitive Model of Document Use during a Resea rch Project. Study II. Decisions at the Reading and Citing Stages. Journal of the American Society for Information Science,1999,50(2):98～114
