5Knorr E.Software as a service:The next big thing[J].Info World,2006 (3):2-4.
6Masao K.Developing software-as-a-service in the rapidly changing environment[J].International Review of Business,2006(8):1-17.
7David C C,Amy Y C.Analysis of a new information systems outsourcing practice:Software-as-a-service business model[J].International Journal of Information Systems and Change Management,2007,2:392-405.
8Walker H B.Risk in supply networks[J].Journal of Purchasing and Supply Management,2003 (9):51-62.