List of Articles Open Access Article Abstract Page Full-Text 1 - Two-stage fuzzy network based on central resource allocation Somayeh sadeghzadeh Mohammad Reza Mozaffari Zohreh Iravani Ali Ebrahimnejad هادی باقرزاده ولمی Open Access Article Abstract Page Full-Text 2 - Stability region of returns to scale using inverse Data Envelopment Analysis Haleh moradi Farhad Hosseinzadeh Lotfi Mohsen Rostamy Open Access Article Abstract Page Full-Text 3 - Productivity Center and Son Using the Malmquist Global Index Esmael Mombini Open Access Article Abstract Page Full-Text 4 - Modeling new ranking behavior of users in online social networks to achieve efficient recommending algorithms Mehdi Safarpour S.Hadi Yaghoubyan Karamolah BagheriFard razieh malekhoseini Samad Nejatian Open Access Article Abstract Page Full-Text 5 - Efficiency analysis in semi-additive production technology in DEA in the presence of production trade-offs Javad Gerami