TY - JOUR AU - Ramazani, Mojtaba AU - nasrollahi saeedlo, rasul TI - Designing a Closed-loop Green Supply Chain in the Face of Competitive Demand and Product Pricing Simultaneously Using the Frog Jump Algorithm JO - Journal of Value Chain Management VL - 4 IS - 10 SP - 53 EP - 68 PY - 2020 DO - ER -