1. Cloud computing (2013). http://en.wikipedia.org/wiki/Cloud_computing .
2. Platform as a service (2013). http://en.wikipedia.org/wiki/Platform_as_a_service .
3. Software as a service (2013). http://en.wikipedia.org/wiki/Software_as_a_service .
4. Hulitt, E., & Vaughn, R. B. (2010). Information system security compliance to FISMA standard: a quantitative measure. Telecommunications Systems, 45(2–3), 139–152.
5. Hofmeyer, S. A., Forrest, S., & Somayaji, A. (1997). Intrusion detection using sequences of system calls. Revised: 17 December. http://www.cs.unm.edu/~steveah/publications/ids.ps.gz .