List of Articles اعداد خاکستری Open Access Article Abstract Page Full-Text 1 - A Hybrid Model of Two-Stage DEA and PROMETHEE in the Gray Environment for Performance Evaluation Alireza Alinezhad Amir Amini Open Access Article Abstract Page Full-Text 2 - Using Linear Goal Programming Approach in Quality Function Deployment Method in Grey Conditions (Case Study: Checking Quality of Olive Oil) Behzad Babakhani Emad Roghanian Shima Azarnia