1. Mahowald, R.P., Sullivan, C.G., Konary, A.: Market Analysis Perspective: Worldwide SaaS and Cloud Services, 2012 — New Models for Delivering Software (2012),
http://www.idc.com/getdoc.jsp?containerId=238635#.UM4QauTqmuM
2. Media, M.R. Global Cloud Computing Market Forecast 2015-2020 (2012),
http://www.marketresearchmedia.com/?p=839
3. LNICST;A. Gouglidis,2010
4. Lecture Notes in Computer Science;F. Hansen,2005
5. Jayaraman, K., et al.: Automatic error finding in access-control policies. In: Proceedings of the 18th ACM Conference on Computer and Communications Security. ACM (2011)