1. Amazon Web Services, AWS. Online at: http://aws.amazon.com.
2. Google App Engine. Online at: http://code.google.com/appengine/.
3. Microsoft Azure. http://www.microsoft.com/azure/.
4. Cloud computing and emerging IT platforms: vision, hype, and reality for delivering computing as the 5th utility;Buyya;Future Generation Computer Systems,2009
5. Secure provenance: the essential of bread and butter of data forensics in cloud computing;Lu,2010