8Suresh,N.C.An extended multi-objective replacement model for flexible automation investment[J].International Journal of Production Research,1992:P1657~ 1672
9Ramasesh,R.V.and Jayakumar,M.D.Inclusion of flexibility benefits in discounted cash flow analyses for investment evaluation:a simulation/ optimization model[J].European Journal of Operational Research,1997(102):P124~ 141