1 Misook Heo, Stephen C. Hirtle. An Empirical Comparison of Visualization Tools to Assist Information Retrieval on the Web. Journal of the American Society for Information Science and Technology, 2001(8):666-675
2 Peter Dmel. WebMap: a graphical hypertext navigation tool. Computer Networks and ISDN Systems,1995(1):85-97
3 Stutart K. Card, George G. Roberston and William York. The WebBook and the Web Forager: An Information Workspace for the World-Wide Web. Proceedings of CHI’96, ACM Press,pp.111-117
4 http://www.cnnic.net.cn  (Accessed Apr. 6, 2004)
5 Matthew Chalmers,Paul Chitson.Bead:explorations in information visualization.Proceedings of the 15th annual international ACM SIGIR conference on Research and development in information retrieval.1992：330-337
6 Kim, H., & Korfhage, R.R. BIRD: Browsing interface for theretrieval of documents. Proceedings of the 1994 IEEE Symposium on Visual Languages, St. Louis, MO.1994：176-177
7 A. M. Pejtersen.A library system for information retrieval based on a cognitive task analysis and supported by an icon-based interface.Proceedings of the 12th annual international ACM SIGIR conference on Research and development in information retrieval.1989：40-47
8 Crouch, D., & Korfhage, RR.The use of visual representations in information retrieval applications.In T. Ichikawa, E. Jungert, & R.R.Korfhage (Eds.), Visual languages and applications.1990：305-326
9 Heath, L.S. et al. Envision: A user-centered database of computer science literature. Communications of the ACM, 38, 4 (April 1995)：52-53 
10 Degi Young,Ben Shneiderman. A graphical filter/flow representation of Boolean queries: a prototype implementation and evaluation. Journal of the American Society for Information Science archive.1993,44(6)：327-339
11 Crow, V.L., Thomas, J.J., et. al. Multidimensional Visualization And Browsing For Intelligence Analysis.Gviz’94: Graphics And Visualization Conference,September 1994
12 Nuchprayoon, Assadaporn & Korfhage, Robert R. GUIDO: A visual tool for retrieving documents. In Proceedings of 1994 IEEE Symposium on Visual Languages：64-71
13 Spoerri, A. InfoCrystal: A visual tool for information retrieval.Proceedings Visualization ’93, San Jose, CA.1993：150-157
14 Mackinlay, J. D., Robertson, G. G. and Card, S. K. The Information Visualizer: A 3D User Interface for Information Retrieval.Advanced Visual Interfaces. 1992：173-179
15 Hemmje, M., C. Kunkel, & A. Willett. LyberWorld – a visualization user interface supporting fultext retrieval. SIGIR’94：249-259
16 Richard H. Fowler. Information retrieval using pathfinder networks.in Pathfinder associative networks: studies in knowledge organization. Ablex Publishing Corp.Norwood, NJ, USA.1990：165-178
17 Lin, X., Soergel, D., and Marchionini, G. A self-organizing semantic map for information retrieval. In Proceedings of the 14th Annual International ACM/SIGIR Conference on Research & Development in Information Retrieval, 1991：262-269
18 Newby,G.B. An investigation of the role of navigation for information retrieval. Proceedings of ASIS’92：20-25
19 Wise, J.A., Thomas, J.J., et. al. Visualizing The Non-Visual: Spatial Analysis And Interaction With Information From Text Documents, in Proceedings of IEEE 95 Information Visualization, October 1995：51-58
20 Hearst, M. TileBars: visualization of term distribution information in full test information access. In Proceedings of the ACM SIGCHI Conference on Human Factors in Computing Systems, 1995：59-66
21 Weiss-Lijn, M., McDonnell, J. T. and James, L. Visualising Document Content with Metadata to Facilitate Goal-Directed Search. Fifth International Conference on Information Visualization (IV01).2001：71-76
22 Olsen, K.A., R.R. Korfhage, M.B.Spring, K.M. Sochats, & J.G. Williams. Visualization of a document collection: The VIBE system. Information Processing & Management 1993,29(1): 69-81
23 Whiting, M. A. & Cramer, N. WebThemeTM: Understanding Web Information Through Visual Analytics.In J.Hartmanis, G. Goos, & J. van Leeuwen (Eds.), Lecture Notes in Computer Science. Berlin: Springer-Verlag：460-468
24 http://www.thinkmap.com/architecture.jsp  (Accessed Apr. 8, 2003)
25 http://www.webbrain.com/html/default_win.html  (Accessed Oct. 12, 2002)
26 Michelle Q. Wang Baldonado,Terry Winograd.SenseMaker: an information-exploration interface supporting the contextual evolution of a user’s interests.Proceedings of the SIGCHI conference on Human factors in computing systems. 1997：11-18
27 David A. Nation. WebTOC: a tool to visualize and quantify Web sites using a hierarchical table of contents browser. CHI’98 conference summary on Human factors in computing systems. 1998：185-186
28 P. Doemel. WebMap——A Graphical Hypertext Navigation Tool, Proc. 2nd Int’l Conf. on the WWW, USA, 1994：785-789
29 http://websom.hut.fi/websom/   (Accessed Jun. 12, 2003)
30 H. Chen, A. L. Houston, R. R. Sewell, B. R. Shatz. Internet browsing and searching: user evaluations of category map and concept space techniques, Journal of the American Society of Information Science.1997,49 (7):582-603
31 Card, S.K., Robertson, G.G., & York, W. The WebBook and the Web Forager: An Information Workspace for the World-Wide Web. Proceedings of the ACM/SIGCHI Conference on Human Factors in Computing Systems.1996：111-119
32 Marti Hearst and Chandu Karadi. Cat-a-Cone: An Interactive Interface for Specifying Searches and Viewing Retrieval Results using a Large Category Hierarchy. Proceedings of the 20th Annual International ACM/SIGIR Conference Philadelphia, PA, July，1997：246-255
33 Richard H. Fowler, Bradley A. Wilson, and Wendy A. L. Fowler. Information Navigator: An information system using associative networks for display and retrieval.http://www.cs.panam.edu/research/information_navigator.pdf (Accessed Mar. 23,2003)
34 Emile Morse, Michael Lewis, Kai A. Olsen. Testing visual information retrieval methodologies case study: comparative analysis of textual, icon, graphical, and “spring” displays. Journal of the American Society for Information Science and Technology, 2002(1):28-40
35 Snelgrove, T. A Method for the Analysis of the Structure of narrative Texts. Literary and Linguistic Computing. 1990,5(3):221-225
36 Brunet, E., What Do Statistics Tell Us? Research in Humanities Computing Clarendon Press: Oxford, Vol,1.1991
37 Thomas K. Landauer,Darrell Laham, and Marcia Derr. From paragraph to graph: Latent semantic analysis for information visualization. Proc Natl Acad Sci USA. 2004 April 6; 101(Suppl 1):5214–5219.http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=387298 (Accessed Mar. 24, 2004)
38 Card, S.K. and J. Mackinlay．The Structure of the Information Visualization Design Space．Proc. of the IEEE Symposium on Information Visualization,1997
39 C. Ware. Information Visualization: Perception for Design. Morgan Kaufmann Publishers, 2000
40  http://www.research.att.com/sw/tools/graphviz/   (Accessed Oct. 4,2003)
41 Mutton, P. Rodgers, P. Spring embedder preprocessing for WWW visualization. Information Visualization, 2002. Proceedings. Six International Conference on, 10-12 July 2002：744-749
42 http://www.uwm.edu/~dxie/Lab/visualization_of_structure.htm (Accessed Sep.23, 2003)
43 http://www-id.imag.fr/EGPGV04/SLIDES/delpino.pdf (Accessed Jan.12, 2004)