List of Articles قیمت نفت خام اوپک Open Access Article Abstract Page Full-Text 1 - Forecasting OPEC Crude Oil Price by Applying Gray Forecasting Model H. Javanmard S. F faghidian Open Access Article Abstract Page Full-Text 2 - Modeling and Forecasting Evaluation of Different Models of Short-Term Memory, Long-Term Memory, Markov Switching and Hyperbolic GARCH in Forecasting OPEC Crude Oil Price Volatility mahmood mohammadi alamuti Mohammadreza Haddadi Younes Nademi