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List of Articles Ramin Sadeghian Open Access Article Abstract Page Full-Text 1 - Modeling the Impact of Raw Materials Suppliers Competition on Procurement Costs in the Green Closed Loop Supply Chain saeed saljooghi Ramin Sadeghian 10.30495/qjopm.2020.1896080.2807 20.1001.1.27169979.1400.15.3.3.2