6PAUL R,GARVEY P R,LANSDOWNE Z F. Risk matrix:an approach for identifying, assessing,and ranking program risks[ J]. Air Force J Logis- tics, 1998(25): 16-19.
7ROBERTS B B. The benefits of integrated quantitative risk management [ R]. 12th Annual Int Symp Int Council Syst Eng, Melbourne, Aust, 2001.