8Handfield R,Walton S V, Sroufe R. Applying environmental crite- ria to supplier assessment : A study in the application of the analy- tical hierarchy process [ J ]. European Journal of Operational Re- search ,2002,141 ( 1 ) : 70 -87.
9Satty T L. The Analytic Hierarchy Process[ M]. New York:Hill, 1980.