5Piatetsky-Shapiro G. Discovery, analysis, and presentation of strong rules[ A]. Pistesky-Shapiro G, Frawley W J.Knowlege Discovery in Database[ C]. Menlo Park: Press, 1991. 229 - 248.
6Han J. Data-driven Discovery of Quantitative Rules in Relational Databases[J]. IEEE Trans Knowledge and Data Engineering, 1993,55:29 - 40.
7CHEN Ming- yan,HAN Jiawei, Yu P. Data mining:An overview from a database perspective[J]. IEEE trans on Knowledge and Data Engineering, 1996,8(6) :867- 881.
8CAI Yang- dong, HAN Jia- wei. Attribute oriented induction in large database[ M]. Menlo Park: AAAI/MIT Press, 1996,213 - 228.
9N Beckman, et al. The R* -tree:an efficient and robust access method for points and rectangles[ M]. Atlantic City: In Proc of ACM SIGMOD, 1990.