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2Wenli Li, Song Zhang,Weihui Dai. A multi-tiered collabora- tive commerce model based on the integration of CORBA and E- JB. Systems, Man and Cybernetics, 2004 IEEE International Con- ference on Volume5,10-13Oet.2004 Page(s):4078-4083 vol.5.
3中国互联网络信息中心(CNNIC).2009年中国青少年上网行为调查报告,20rb.4.
4Business office: http: //www.jhsph.edu/business office/Student Accounts and Business Services.htrnl.
5School Charge: http: //www.SchoolCharege.com/ School Charge instant online payment system for education!.html.
