5Alex Berson, Stephen Smith, Kerr Thearling. Building Data Mining Application for CRM [M]. America: Mc Gra Hill Companies, Inc. , 2000.
6Jiawei Han.Micheline Kamber[].Data Mining:Concepts and Techniques.2000
7Daskalaki S,Kopanas I,Gourdara M,et al.Data mining for decision support on customer insolvency in telecommunications business[].European Journal of Operational Research.2003