1. Trouble on the final frontier: NASA's scientific missions have enjoyed spectacular success. But significant cost overruns and launch delays jeopardize future missions;Lawler;Science,2009
2. Report of the commission to assess United States national security space management and organization;Rumsfeld,2001
3. Top Five systems engineering issues in defense industry;NDIA,2003
4. Report of the defense science board / air force scientific advisory board joint task force on acquisition of national security space programs;Young,2003
5. Space acquisitions: improvement needed in space systems acquisitions and keys to achieving them;Government Accountability Office,2006