List of Articles STR Model Open Access Article Abstract Page Full-Text 1 - Estimation of Natural Gas Demand Function in Residential and Commercial Sectors in Iran: a Nonlinear Approach علیرضا حاج ملاعلی کنی مجید عباسپور زهرا عابدی Open Access Article Abstract Page Full-Text 2 - The Co-movement Between Bitcoin, Gold, USD and Oil: DCC-GARCH and Smooth Transition Regression (STR) Model Yazdan Gudarzi Farahani Ehsan Aghari Ghara Mnasour Haghtalab Open Access Article Abstract Page Full-Text 3 - The effect of financial indicators on economic growth in Islamic countries using a non-linear model hadi agababei Manijeh Hadinjad S. Khashayar Seyed Shokri 10.30495/fed.2023.707986