%0 Journal Article %A saljooghi, saeed, Sadeghian, Ramin %T Modeling the Impact of Raw Materials Suppliers Competition on Procurement Costs in the Green Closed Loop Supply Chain %J The Journal of Productivity Management %V 15 %N 3 %P 65-89 %D 2021 %R 10.30495/qjopm.2020.1896080.2807 %U https://sanad.iau.ir/fa/Article/974885