List of Articles integrated energy systems Open Access Article Abstract Page Full-Text 1 - A New Reliability Assessment Approach for Operation Unified Energy System mojtaba jamiati Open Access Article Abstract Page Full-Text 2 - Joint Optimization of Integrated Energy Systems in the Presence of Renewable Energy Sources, Power-to-Gas Systems and Energy Storage Mahroo Sattar Mahmoud Samiei Moghaddam Azita Azarfar Nasrin Salehi Mojtaba Vahedi