List of Articles متغیرهای کمکی Open Access Article Abstract Page Full-Text 1 - Determining the Russell Technical Efficiency of measure in the Presence of Flexible Factors based on slack variables Majid Sedighi Hassan Kiyadeh Saber Saati Mohtadi Sohrab Kordrostami Open Access Article Abstract Page Full-Text 2 - Efficiency Evaluation of Two-Stage Data Envelopment Analysis Model Based on Triangular Intuitionistic Fuzzy numbers andslack variables nafiseh javaherian Ali Hamzehee Hossein sayyadi Tooranloo Reza Soleymani-Damaneh