1. The Economic Impacts of Inadequate Infrastructure for Software Testing;Tassey,2002
2. Next Generation Implementation Plan, 2011
http://www.faa.gov/nextgen/media/ng2011_implementation_plan.pdf
3. What is SESAR
http://www.eurocontrol.int/sesar/public/standard_page/overview.html
4. Common Concepts Underlying Safety, Security, and Survivability Engineering;Firesmith,2003