1. Amazon Web Services, https://aws.amazon.com/.
2. Gartner, “Gartner Says Market Leaders Failed to Capitalize on PaaS Growth in 2015”, http://www.gartner.com/newsroom/id/3283217.
3. SP 800-145, “A NIST definition of Cloud Computing”, http://csrc.nist.gov/publications/nistpubs/800-145/SP800-145.pdf, September 2011.
4. Microsoft Azure, https://azure.microsoft.com.
5. Google App Engine, https://appengine.google.com.