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Syriopoulos T, Tsatsaronis M. Estimating and Testing Optimal Hedge Ratio Efficiency in Global Commodities Markets. International Conference on Business and Economics of the Hellenic Open University, retrieved from https://www. researchgate. net/publication/324165150_Estimating_and_Testing_Optim al_Hedge_Ratio_Efficiency_in_Global_Commodities_Markets. 2018.\par \par }