3[1]Hermans B. Intelligent Software Agents on the Internet: an Inventory of Currently Offered Functionality in the Information Society & a Prediction of (Near-) Future Developments. Available from WWW: ＜http: //www. hermans. org/agents＞
4[3]Jansen J. Using Intelligent Agent to Enhance Search Engine Performance. Available from WWW: ＜http: // www. cccs. usma. edu/usma/academic/cccs/instruct/jansen/＞
5[4]Miller D. Three Types of Intelligent Agents, Their Uses, and Their Future. Internet Trend Watch for Library, 1997,2(3). Available from WWW: ＜http: //www. itwfl. com/ types. html＞
6[5]Hauser R. NetWatch Top Ten-Intelligent Agents/ Information Agents. Available from WWW: ＜http: /www. pulver. com/netwatch/topten/tt9. htm＞
7[6]Johanna D M. Intelligent Information Agents. Available from WWW: ＜http: //www. nap. edu/readingroom/books/ screen/12. html＞
