List of Articles انتخاب تأمین کنندگان Open Access Article Abstract Page Full-Text 1 - Decision models for evaluation and selection of suppliers in the presence of cardinal and ordinal data, weight restrictions, and non-discretionary factors: An approach based on DEA with double frontiers Hossein Azizi Rasul Jahed Open Access Article Abstract Page Full-Text 2 - Using Group Decision Making Techniques and Optimizing Purchase Plan to Rank Suppliers (Case Study: IKCO Spare Parts & After Sales Services ISACO) Salomeh Ghasempour Farsani Alireza Rashidi komijan Open Access Article Abstract Page Full-Text 3 - Suppliers’ Selection Problem in Multiple Sourcing Cases under Uncertainty Environment: Models and Solution Procedures Leyla Fazli Alireza Eydi Open Access Article Abstract Page Full-Text 4 - Suppliers’ Selection Problem in Multiple Sourcing Cases under Uncertainty Environment: Models and Solution Procedures Leyla Fazli Alireza Eydi