List of Articles Open Access Article Abstract Page Full-Text 1 - Nonhomogeneous DMUs in DEA: A Directional Distance Function Approach Mona Barat Ghasem Tohidi Open Access Article Abstract Page Full-Text 2 - Evaluation of decision-making units with interval grey data in DEA Jafar Pourmahmoud Mahdi Eini Davood Darvishi Saeid Mehrabian Open Access Article Abstract Page Full-Text 3 - Numerical simulations of different bearings to obtain the surface tension through the finite element method Behrouz Bohlouli Sattar Jedari Salami