6Hui-Min Chen and Michael D. Cooper. Using clustering techniques to detect usage patterns in a Web based information system. JASIST. 2001, 52 (11).
7Johan Bollen Evaluation of digital library impact and user communities by analysis of usage patterns. D-Lib Magazine 2002, 8 (6).
8Zaiane O R, Xin M, Han J. Discovering Web access patterns and trends by applying OLAP and data mining technology on Web logs. Proc of Advances in Digital Libraries Conf, Santa Barbara, CA, 1998.
9Earl Babbie. The Practice of Social Research[ M]. Beijing: Tsing- hua Press, 2007:215.
