1. Vaquero L M, Rodero-Merino L, Caceres J, Lindner M. A break in the clouds: towards a cloud definition. ACM SIGCOMM Computer Communication Review, 2008, 39(1): 50–55
2. Armbrust M, Fox RA. a, Joseph A D, Katz R H, Konwinski A, Lee G, Patterson D A, Rabkin A, Zaharia M. Above the clouds: a berkeley view of cloud computing. Technical Report, Dept. Electrical Eng. and Comput. Sciences, University of California, Berkeley, 2009
3. Pettey C, Stevens H. Gartner maps out the rapidly evolving market for cloud infrastructure as a service. http://www.gartner.com/it/page.jsp?id=1622514,2011
4. Amazon ec2. http://aws.amazon.com/ec2/ , 2013
5. Ibm smartcloud. http://www.ibm.com/cloud-computing/social/us/en/ , 2013