1[1]Wilson E.J.The Relative Importance of Supplier Selection Criteria:A review and Update.International Journal of Purchasing﹠Materials Management,1994,30(3):35-41.
2[2]Sanchoy K.Das Layek Abdel-Malek.Modeling the Flexibility of Order Quantities and Lead-times in Supply Chains.Int.J.Production Economics 85(2003):171-181.
