4Buyyaa R, Chee S Y, Srikumar V, et al.Cloud Comput- ing And Emerging IT Platform: Vision, Hype And Reality For Delivering Computing As The 5th Utility[J].Future Generation Computer Systems, 2009,25 (6) : 599-616.
5Luis M V, Luis R M, Caceres J, et al. ABreak In The Clouds: Towards A Cloud Definition[J].ACMSIGCOMM Com- puter Communication Review, 2009,39 ( 1 ) : 50-55.