5Jon Anion. The Past Present and Future of Customer Access Centers [ J]. International Journal of Service Industry Management, 2000, Vol. 11 (2), pp. 120-130.
6Kannan P. K., H. R. Rao. Introduction to the special issue: decision support issues in customer relationship management and interactive marketing for e-commerce [J]. Decision Support Systems, 2001, Vol. 32 (2), pp. 83-84.
7White paper, a business overview of mysap erm. http: //www. sap. com.