8Paul R, Garvey P R, Lansdowne Z F. Risk matrix: an approach for identifying, assessing, and ranking program risks. [ J ] . Air Journal of Logistics, 1998,25 : 16 - 19.
9Lansdowne Z F, Woodwar B S. Applying the Borda method. [ J ]. Air Journal of Logistics, 1996,20:27 - 29.