List of Articles Open Access Article Abstract Page Full-Text 1 - Calculation of the Efficiency of Two-Stage Network Structures with Additional Inputs to the Second Stage by SBM Approach: A Case Study on Credit Branches of an Iranian State Bank in Guilan Province Saeed Jahangard Patavani Nasima Mahboubi Open Access Article Abstract Page Full-Text 2 - An Additive Model for Estimation Return to Scale in Regulated Environment with Quasi-Fixed Inputs in Data Envelopment Analysis (DEA) Farshid Emami Toktam Nasirzade Tabrizi Open Access Article Abstract Page Full-Text 3 - Some Conditions for Characterizing Minimum Face in Non-Radial DEA Models with Undesirable Outputs Sevan Sohraiee Open Access Article Abstract Page Full-Text 4 - Satisfaction Function in Present Undesirable Factors Zohreh Iravani Mohammad Mohseni Takaloo Open Access Article Abstract Page Full-Text 5 - Data Envelopment Analysis with LINGO Modeling for Technical Educational Group of an Organization Mohd Rizwanullah Open Access Article Abstract Page Full-Text 6 - Estimating the Efficient Portfolio in Non-Radial DEA and DEA-R Models Forod Najafi Mohammad Reza Mozaffari