List of Articles Open Access Article Abstract Page Full-Text 1 - Numerical Study of Unsteady Flow of Gas Through a Porous Medium By Means of Chebyshev Pseudo-Spectral Method S. M. Hosseini Herat E. Babolian S. Abbasbandy Open Access Article Abstract Page Full-Text 2 - Network Data Envelopment Analysis Models For Measuring Efficiency Of a Four-Stage Supply Chain With Returned Outputs M. Vaez-Ghasemi Z. Moghaddas B. Rahmani Open Access Article Abstract Page Full-Text 3 - A Note On `A New Method For Solving An Arbitrary Fully Fuzzy Linear System' S. Salahshour A. Ahmadian F. Ismail Open Access Article Abstract Page Full-Text 4 - Estimating Upper and Lower Bounds For Industry Efficiency With Unknown Technology R. Kazemi Matin R. Azizi N. Pasban M. Mirjaberi Open Access Article Abstract Page Full-Text 5 - Matrix Approach to Robustness Analysis for Strategy Selection A. Sorourkhah S. Babaie-Kafaki A. Azar M. Shafiei-Nikabadi Open Access Article Abstract Page Full-Text 6 - Image Compression Method Based on QR-Wavelet Transformation N. Biranvand H. Parvizi Mosaed Open Access Article Abstract Page Full-Text 7 - Connectivity Restoration in Wireless Sensor and Actor Networks using Distributed Learning Automata M. Jahanshahi M. Maddah Open Access Article Abstract Page Full-Text 8 - Comparative Content Analysis of Mathematics Textbooks in first Grade Students of Elementary Schools in Iran, Japan and America E. Reyhani M. Izadi