List of Articles Keywords: Supply Chain Open Access Article Abstract Page Full-Text 1 - Efficiency of 4 stage supply chain in presence of non discretionary , undesirable and negative factors Using SBM model in DEA mehdi shoga farhad hoseinzadeh lotfi امیر غلام ابری Alireza Rashidi Komijan 10.30495/eco.2020.1899015.2357 Open Access Article Abstract Page Full-Text 2 - Supply Chain Integration and its Impact on Sustainability of Export and Marketing Development in Tourism Industry by Relying on the Role of Agencies (A Study in Tabriz Travel Agencies) homa sarvari laleh Hossein Gharehbiglo Behjat Abchar