List of Articles generalized method of moments (GMM) Open Access Article Abstract Page Full-Text 1 - The Productivity of Energy and the Effective Factors on it. (Manufacturing Industries of IRAN) Ebrahim Niknaghsh نقی شجاع Amir Gholam Abri Mohamad Mehdi Movahedi Open Access Article Abstract Page Full-Text 2 - Role of Information and Communication Technologies (ICT) on Growth of Agriculture Sector: A case study of OPEC countries Somayeh Khanjari Sadati Fatemeh Fathi